| Common Name | Scientific Name | Code |
| n/a | Camissonia dentata (Cav.) Reiche [excluded] | CADE34 |
| n/a | Circaea ?intermedia Ehrh. (pro sp.) [alpina ? lutetiana] | CIIN4 |
| n/a | Epilobium ?pulchrum Suksdorf (pro sp.) [luteum ? sp.] | EPPU2 |
| n/a | Epilobium ?wisconsinense Ugente [ciliatum ? coloratum] | EPWI |
| n/a | Epilobium dodonaei Vill. | EPDO |
| n/a | Epilobium montanum L. | EPMO2 |
| n/a | Fuchsia magellanica Lam. var. macrostema (Ruiz & Pav?n) Munz [excluded] | FUMAM |
| n/a | Lopezia Cav. | LOPEZ2 |
| n/a | Lopezia coronata Andr. [excluded] | LOCO21 |
| n/a | Ludwigia ?lacustris Eames (pro sp.) [brevipes ? palustris] | LULA5 |
| n/a | Ludwigia grandiflora (M. Micheli) Greuter & Burdet ssp. hexapetala (Hook. & Arn.) Nesom & Kartesz | LUGRH |
| aboriginal willowherb | Epilobium billardierianum Ser. | EPBI2 |
| aboriginal willowherb | Epilobium billardierianum Ser. ssp. cinereum (A. Rich.) Raven & Engelhorn | EPBIC |
| alyssum evening-primrose | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. alyssoides (Hook. & Arn.) Raven | CABOA |
| Andre's fuchsia | Fuchsia andrei I.M. Johnston | FUAN |
| anglestem primrose-willow | Ludwigia leptocarpa (Nutt.) Hara | LULE4 |
| Antioch Dunes evening-primrose | Oenothera deltoides Torr. & Fr?m. ssp. howellii (Munz) W. Klein | OEDEH |
| arctic willowherb | Epilobium arcticum Samuelsson | EPAR2 |
| aretillo | Fuchsia arborescens Sims. | FUAR3 |
| Argentine evening-primrose | Oenothera mollissima L. | OEMO |
| Atwood's evening-primrose | Camissonia atwoodii Cronq. | CAAT10 |
| beach evening-primrose | Oenothera drummondii Hook. | OEDR |
| beach suncup | Camissonia cheiranthifolia (Hornem. ex Spreng.) Raimann | CACH13 |
| beach suncup | Camissonia cheiranthifolia (Hornem. ex Spreng.) Raimann ssp. cheiranthifolia | CACHC |
| beach suncup | Camissonia cheiranthifolia (Hornem. ex Spreng.) Raimann ssp. suffruticosa (S. Wats.) Raven | CACHS |
| beaked clarkia | Clarkia rostrata W.S. Davis | CLRO2 |
| beeblossom | Gaura L. | GAURA |
| Berlandier's sundrops | Calylophus berlandieri Spach | CABE6 |
| Berlandier's sundrops | Calylophus berlandieri Spach ssp. berlandieri | CABEB2 |
| Berlandier's sundrops | Calylophus berlandieri Spach ssp. pinifolius (Engelm. ex Gray) Towner | CABEP2 |
| biennial beeblossom | Gaura biennis L. | GABI2 |
| bigfruit evening-primrose | Oenothera macrocarpa Nutt. | OEMA |
| bigfruit evening-primrose | Oenothera macrocarpa Nutt. ssp. incana (Gray) Wagner | OEMAI2 |
| bigfruit evening-primrose | Oenothera macrocarpa Nutt. ssp. macrocarpa | OEMAM |
| birdcage evening-primrose | Oenothera deltoides Torr. & Fr?m. | OEDE2 |
| birdcage evening-primrose | Oenothera deltoides Torr. & Fr?m. ssp. ambigua (S. Wats.) W. Klein | OEDEA |
| birdcage evening-primrose | Oenothera deltoides Torr. & Fr?m. ssp. cognata (Jepson) W. Klein | OEDEC2 |
| birdcage evening-primrose | Oenothera deltoides Torr. & Fr?m. ssp. deltoides | OEDED4 |
| blackfoot groundsmoke | Gayophytum racemosum Torr. & Gray | GARA |
| Blackfoot River evening-primrose | Camissonia andina (Nutt.) Raven | CAAN14 |
| bog willowherb | Epilobium leptophyllum Raf. | EPLE2 |
| Bolivian fuchsia | Fuchsia boliviana Carr. | FUBO |
| Booth's evening-primrose | Camissonia boothii (Dougl. ex Lehm.) Raven | CABO7 |
| Booth's evening-primrose | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. intermedia (Munz) Raven | CABOI |
| Booth's suncup | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. boothii | CABOB |
| Botta's clarkia | Clarkia bottae (Spach) H.F. & M.E. Lewis | CLBO |
| Brandegee's clarkia | Clarkia biloba (Dur.) A. Nels. & J.F. Macbr. ssp. brandegeeae (Jepson) H.F. & M.E. Lewis | CLBIB |
| broadleaf enchanter's nightshade | Circaea lutetiana L. | CILU |
| broadleaf enchanter's nightshade | Circaea lutetiana L. ssp. canadensis (L.) Aschers. & Magnus | CILUC |
| browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven | CACL4 |
| browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. aurantiaca (Munz) Raven | CACLA2 |
| browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. claviformis | CACLC3 |
| browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. cruciformis (Kellogg) Raven | CACLC |
| browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. funerea (Raven) Raven | CACLF |
| browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. integrior (Raven) Raven | CACLI |
| browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. rubescens (Raven) Raven | CACLR2 |
| California evening-primrose | Oenothera arizonica (Munz) W.L. Wagner | OEAR4 |
| California evening-primrose | Oenothera californica (S. Wats.) S. Wats. | OECA2 |
| California evening-primrose | Oenothera californica (S. Wats.) S. Wats. ssp. avita W. Klein | OECAA2 |
| California evening-primrose | Oenothera californica (S. Wats.) S. Wats. ssp. californica | OECAC |
| California suncup | Camissonia californica (Nutt. ex Torr. & Gray) Raven | CACA32 |
| California willowherb | Epilobium foliosum (Torr. & Gray) Suksdorf | EPFO |
| Calylophus berlandieri ssp. berlandieri | Calylophus drummondianus Spach ssp. berlandieri (Spach) Towner & Raven | CADRB |
| Calylophus berlandieri ssp. berlandieri | Oenothera serrulata Nutt. ssp. drummondii (Torr. & Gray) Munz | OESED |
| Calylophus berlandieri ssp. pinifolius | Calylophus drummondianus Spach | CADR4 |
| Calylophus berlandieri ssp. pinifolius | Calylophus serrulatus (Nutt.) Raven var. spinulosus (Nutt. ex Torr. & Gray) Shinners | CASES2 |
| Calylophus berlandieri ssp. pinifolius | Meriolix capillifolia (Scheele) Small | MECA11 |
| Calylophus berlandieri ssp. pinifolius | Meriolix hillii Small | MEHI5 |
| Calylophus berlandieri ssp. pinifolius | Meriolix melanoglottis Rydb. ex Small | MEME2 |
| Calylophus berlandieri ssp. pinifolius | Oenothera serrulata Nutt. ssp. pinifolia (Engelm. ex Gray) Munz | OESEP |
| Calylophus hartwegii ssp. fendleri | Oenothera fendleri Gray | OEFE |
| Calylophus hartwegii ssp. fendleri | Oenothera hartwegii Benth. var. fendleri (Gray) Gray | OEHAF3 |
| Calylophus hartwegii ssp. filifolius | Calylophus hartwegii (Benth.) Raven var. filifolius (Eastw.) Shinners | CAHAF3 |
| Calylophus hartwegii ssp. filifolius | Oenothera filifolia (Eastw.) Tidestrom | OEFI |
| Calylophus hartwegii ssp. filifolius | Oenothera hartwegii Benth. var. filifolia (Eastw.) Munz | OEHAF2 |
| Calylophus hartwegii ssp. filifolius | Oenothera tubicula Gray var. filifolia Eastw. | OETUF |
| Calylophus hartwegii ssp. hartwegii | Galpinsia hartwegii (Benth.) Britt. | GAHA3 |
| Calylophus hartwegii ssp. hartwegii | Oenothera hartwegii Benth. | OEHA3 |
| Calylophus hartwegii ssp. hartwegii | Oenothera hartwegii Benth. var. typica Munz | OEHAT |
| Calylophus hartwegii ssp. hartwegii | Salpingia hartwegii (Benth.) Raimann | SAHA9 |
| Calylophus hartwegii ssp. maccartii | Calylophus hartwegii (Benth.) Raven var. maccartii Shinners | CAHAM2 |
| Calylophus hartwegii ssp. maccartii | Oenothera greggii Gray var. pringlei Munz | OEGRP3 |
| Calylophus hartwegii ssp. maccartii | Oenothera pringlei (Munz) Munz | OEPR4 |
| Calylophus hartwegii ssp. pubescens | Calylophus hartwegii (Benth.) Raven var. pubescens (Gray) Shinners | CAHAP2 |
| Calylophus hartwegii ssp. pubescens | Galpinsia camporum Woot. & Standl. | GACA11 |
| Calylophus hartwegii ssp. pubescens | Galpinsia interior Small | GAIN2 |
| Calylophus hartwegii ssp. pubescens | Oenothera greggii Gray | OEGR5 |
| Calylophus hartwegii ssp. pubescens | Oenothera greggii Gray var. lampasana (Buckl.) Munz | OEGRL2 |
| Calylophus hartwegii ssp. pubescens | Oenothera greggii Gray var. pubescens Gray | OEGRP2 |
| Calylophus lavandulifolius | Calylophus hartwegii (Benth.) Raven ssp. lavandulifolius (Torr. & Gray) Towner & Raven | CAHAL |
| Calylophus lavandulifolius | Calylophus hartwegii (Benth.) Raven var. lavandulifolius (Torr. & Gray) Shinners | CAHAL2 |
| Calylophus lavandulifolius | Galpinsia lavandulifolia (Torr. & Gray) Small | GALA11 |
| Calylophus lavandulifolius | Oenothera lavandulifolia Torr. & Gray | OELA5 |
| Calylophus lavandulifolius | Oenothera lavandulifolia Torr. & Gray var. glandulosa Munz | OELAG3 |
| Calylophus lavandulifolius | Oenothera lavandulifolia Torr. & Gray var. typica Munz | OELAT |
| Calylophus serrulatus | Calylophus australis Towner & Raven | CAAU13 |
| Calylophus serrulatus | Meriolix intermedia Rydb. ex Small | MEIN8 |
| Calylophus serrulatus | Meriolix oblanceolata Rydb. | MEOB5 |
| Calylophus serrulatus | Meriolix serrulata (Nutt.) Walp. | MESE5 |
| Calylophus serrulatus | Oenothera serrulata Nutt. | OESE3 |
| Calylophus serrulatus | Oenothera serrulata Nutt. var. typica Munz | OESET |
| Calylophus toumeyi | Calylophus hartwegii (Benth.) Raven ssp. toumeyi (Small) Towner & Raven | CAHAT2 |
| Calylophus toumeyi | Galpinsia toumeyi Small | GATO4 |
| Calylophus toumeyi | Oenothera hartwegii Benth. var. toumeyi (Small) Munz | OEHAT2 |
| Calylophus toumeyi | Oenothera toumeyi (Small) Tidestrom | OETO |
| Calylophus tubicula | Oenothera tubicula Gray | OETU2 |
| Camissonia andina | Oenothera andina Nutt. | OEAN3 |
| Camissonia arenaria | Chylismia arenaria A. Nels. | CHAR9 |
| Camissonia arenaria | Oenothera arenaria (A. Nels.) Raven | OEAR2 |
| Camissonia arenaria | Oenothera cardiophylla Torr. var. splendens Munz & Johnston | OECAS |
| Camissonia bistorta | Oenothera bistorta Nutt. ex Torr. & Gray | OEBI4 |
| Camissonia bistorta | Oenothera bistorta Nutt. ex Torr. & Gray var. veitchiana Hook. | OEBIV |
| Camissonia boothii ssp. alyssoides | Camissonia boothii (Dougl. ex Lehm.) Raven var. alyssoides (Hook. & Arn.) N.& P. Holmgren | CABOA2 |
| Camissonia boothii ssp. alyssoides | Camissonia boothii (Dougl. ex Lehm.) Raven var. villosa (S. Wats.) Cronq. | CABOV |
| Camissonia boothii ssp. alyssoides | Oenothera alyssoides Hook. & Arn. | OEAL4 |
| Camissonia boothii ssp. alyssoides | Oenothera alyssoides Hook. & Arn. var. villosa S. Wats. | OEALV2 |
| Camissonia boothii ssp. alyssoides | Oenothera boothii Dougl. ex Lehm. ssp. alyssoides (Hook. & Arn.) Munz | OEBOA |
| Camissonia boothii ssp. boothii | Oenothera boothii Dougl. ex Lehm. | OEBO2 |
| Camissonia boothii ssp. condensata | Camissonia boothii (Dougl. ex Lehm.) Raven var. condensata (Munz) Cronq. | CABOC2 |
| Camissonia boothii ssp. condensata | Oenothera boothii Dougl. ex Lehm. ssp. condensata (Munz) Munz | OEBOC |
| Camissonia boothii ssp. condensata | Oenothera decorticans (Hook. & Arn.) Greene var. condensata Munz | OEDEC6 |
| Camissonia boothii ssp. decorticans | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. rutila (A. Davids.) Munz | CABOR |
| Camissonia boothii ssp. decorticans | Camissonia boothii (Dougl. ex Lehm.) Raven var. decorticans (Hook. & Arn.) Cronq. | CABOD3 |
| Camissonia boothii ssp. decorticans | Gaura decorticans Hook. & Arn. | GADE4 |
| Camissonia boothii ssp. decorticans | Oenothera boothii Dougl. ex Lehm. ssp. decorticans (Hook. & Arn.) Munz | OEBOD |
| Camissonia boothii ssp. decorticans | Oenothera boothii Dougl. ex Lehm. ssp. rutila (A. Davids.) Munz | OEBOR |
| Camissonia boothii ssp. decorticans | Oenothera decorticans (Hook. & Arn.) Greene | OEDE5 |
| Camissonia boothii ssp. decorticans | Oenothera decorticans (Hook. & Arn.) Greene var. rutila (A. Davids.) Munz | OEDER |
| Camissonia boothii ssp. desertorum | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. inyoensis (Munz) Munz | CABOI2 |
| Camissonia boothii ssp. desertorum | Camissonia boothii (Dougl. ex Lehm.) Raven var. desertorum (Munz) Cronq. | CABOD4 |
| Camissonia boothii ssp. desertorum | Oenothera boothii Dougl. ex Lehm. ssp. desertorum (Munz) Munz | OEBOD2 |
| Camissonia boothii ssp. desertorum | Oenothera boothii Dougl. ex Lehm. ssp. inyoensis Munz | OEBOI |
| Camissonia boothii ssp. desertorum | Oenothera decorticans (Hook. & Arn.) Greene var. desertorum Munz | OEDED2 |
| Camissonia boothii ssp. intermedia | Oenothera boothii Dougl. ex Lehm. ssp. intermedia Munz | OEBOI2 |
| Camissonia breviflora | Oenothera breviflora Torr. & Gray | OEBR4 |
| Camissonia breviflora | Taraxia breviflora (Torr. & Gray) Nutt. ex Small | TABR5 |
| Camissonia brevipes ssp. arizonica | Oenothera brevipes Gray ssp. arizonica Raven | OEBRA |
| Camissonia brevipes ssp. brevipes | Oenothera brevipes Gray | OEBR5 |
| Camissonia brevipes ssp. pallidula | Oenothera brevipes Gray ssp. pallidula (Munz) Raven | OEBRP |
| Camissonia brevipes ssp. pallidula | Oenothera brevipes Gray var. pallidula Munz | OEBRP2 |
| Camissonia brevipes ssp. pallidula | Oenothera pallidula (Munz) Munz | OEPA8 |
| Camissonia californica | Eulobus californicus Nutt. ex Torr. & Gray | EUCA12 |
| Camissonia californica | Oenothera californica (Nutt. ex Torr. & Gray) Greene | OECA8 |
| Camissonia californica | Oenothera leptocarpa Greene | OELE2 |
| Camissonia campestris ssp. campestris | Oenothera campestris Greene | OECA7 |
| Camissonia campestris ssp. campestris | Oenothera campestris Greene ssp. parishii (Abrams) Munz | OECAP |
| Camissonia campestris ssp. campestris | Oenothera dentata Cav. var. campestris (Greene) Jepson | OEDEC5 |
| Camissonia campestris ssp. campestris | Oenothera dentata Cav. var. johnstonii Munz | OEDEJ |
| Camissonia campestris ssp. campestris | Oenothera dentata Cav. var. parishii (Abrams) Munz | OEDEP2 |
| Camissonia cardiophylla ssp. cardiophylla | Oenothera cardiophylla Torr. | OECA9 |
| Camissonia cardiophylla ssp. cardiophylla | Oenothera cardiophylla Torr. var. typica Munz | OECAT |
| Camissonia cardiophylla ssp. robusta | Oenothera cardiophylla Torr. ssp. robusta Raven | OECAR |
| Camissonia chamaenerioides | Oenothera chamaenerioides Gray | OECH4 |
| Camissonia cheiranthifolia ssp. cheiranthifolia | Oenothera cheiranthifolia Hornem. ex Spreng. | OECH5 |
| Camissonia cheiranthifolia ssp. cheiranthifolia | Oenothera cheiranthifolia Hornem. ex Spreng. var. nitida (Greene) Munz | OECHN |
| Camissonia cheiranthifolia ssp. suffruticosa | Oenothera cheiranthifolia Hornem. ex Spreng. ssp. suffruticosa (S. Wats.) Munz | OECHS2 |
| Camissonia claviformis ssp. aurantiaca | Camissonia claviformis (Torr. & Fr?m.) Raven var. aurantiaca (Munz) Cronq. | CACLA3 |
| Camissonia claviformis ssp. aurantiaca | Oenothera claviformis Torr. & Fr?m. ssp. aurantiaca (Munz) Raven | OECLA |
| Camissonia claviformis ssp. aurantiaca | Oenothera claviformis Torr. & Fr?m. var. aurantiaca (Munz) Munz | OECLA2 |
| Camissonia claviformis ssp. claviformis | Oenothera claviformis Torr. & Fr?m. | OECL2 |
| Camissonia claviformis ssp. cruciformis | Camissonia claviformis (Torr. & Fr?m.) Raven var. cruciformis (Kellogg) Cronq. | CACLC4 |
| Camissonia claviformis ssp. cruciformis | Oenothera claviformis Torr. & Fr?m. ssp. cruciformis (Kellogg) Raven | OECLC |
| Camissonia claviformis ssp. cruciformis | Oenothera claviformis Torr. & Fr?m. var. citrina Raven | OECLC3 |
| Camissonia claviformis ssp. cruciformis | Oenothera claviformis Torr. & Fr?m. var. cruciformis (Kellogg) Munz | OECLC2 |
| Camissonia claviformis ssp. cruciformis | Oenothera cruciformis Kellogg | OECR |
| Camissonia claviformis ssp. funerea | Camissonia claviformis (Torr. & Fr?m.) Raven var. funerea (Raven) Cronq. | CACLF2 |
| Camissonia claviformis ssp. funerea | Oenothera claviformis Torr. & Fr?m. ssp. funerea Raven | OECLF |
| Camissonia claviformis ssp. integrior | Camissonia claviformis (Torr. & Fr?m.) Raven var. purpurascens (S. Wats.) Cronq. | CACLP5 |
| Camissonia claviformis ssp. integrior | Oenothera claviformis Torr. & Fr?m. ssp. integrior Raven | OECLI |
| Camissonia claviformis ssp. integrior | Oenothera claviformis Torr. & Fr?m. var. purpurascens (S. Wats.) Munz | OECLP |
| Camissonia claviformis ssp. integrior | Oenothera scapoidea Nutt. ex Torr. & Gray var. purpurascens S. Wats. | OESCP |
| Camissonia claviformis ssp. lancifolia | Camissonia claviformis (Torr. & Fr?m.) Raven var. lancifolia (Heller) Cronq. | CACLL2 |
| Camissonia claviformis ssp. lancifolia | Chylismia lancifolia Heller | CHLA11 |
| Camissonia claviformis ssp. lancifolia | Oenothera claviformis Torr. & Fr?m. ssp. lancifolia (Heller) Raven | OECLL |
| Camissonia claviformis ssp. peeblesii | Oenothera claviformis Torr. & Fr?m. ssp. peeblesii (Munz) Raven | OECLP5 |
| Camissonia claviformis ssp. peeblesii | Oenothera claviformis Torr. & Fr?m. var. peeblesii Munz | OECLP4 |
| Camissonia claviformis ssp. peirsonii | Oenothera claviformis Torr. & Fr?m. ssp. peirsonii (Munz) Raven | OECLP2 |
| Camissonia claviformis ssp. peirsonii | Oenothera claviformis Torr. & Fr?m. var. peirsonii Munz | OECLP3 |
| Camissonia claviformis ssp. rubescens | Oenothera claviformis Torr. & Fr?m. ssp. rubescens Raven | OECLR |
| Camissonia claviformis ssp. yumae | Oenothera claviformis Torr. & Fr?m. ssp. yumae Raven | OECLY |
| Camissonia confertiflora | Oenothera confertiflora Raven | OECO4 |
| Camissonia contorta | Oenothera contorta Dougl. ex Lehm. | OECO5 |
| Camissonia contorta | Oenothera cruciata (S. Wats.) Munz | OECR2 |
| Camissonia contorta | Oenothera dentata auct. non Cav. [misapplied] | OEDE8 |
| Camissonia eastwoodiae | Oenothera eastwoodiae (Munz) Raven | OEEA |
| Camissonia eastwoodiae | Oenothera scapoidea Nutt. ex Torr. & Gray var. eastwoodiae Munz | OESCE |
| Camissonia exilis | Oenothera exilis Raven | OEEX |
| Camissonia gouldii | Oenothera gouldii (Raven) Welsh & Atwood | OEGO |
| Camissonia graciliflora | Oenothera graciliflora Hook. & Arn. | OEGR6 |
| Camissonia guadalupensis ssp. clementina | Oenothera guadalupensis S. Wats. p.p. | OEGU2 |
| Camissonia guadalupensis ssp. clementina | Oenothera guadalupensis S. Wats. ssp. clementina Raven | OEGUC |
| Camissonia heterochroma | Camissonia heterochroma (S. Wats.) Raven ssp. monoensis (Munz) Raven | CAHEM |
| Camissonia heterochroma | Camissonia heterochroma (S. Wats.) Raven var. monoensis (Munz) Cronq. | CAHEM2 |
| Camissonia heterochroma | Oenothera heterochroma S. Wats. | OEHE4 |
| Camissonia heterochroma | Oenothera heterochroma S. Wats. ssp. monoensis (Munz) Raven | OEHEM |
| Camissonia heterochroma | Oenothera heterochroma S. Wats. var. monoensis Munz | OEHEM3 |
| Camissonia hilgardii | Oenothera andina Nutt. var. hilgardii (Greene) Munz | OEANH |
| Camissonia hilgardii | Oenothera contorta Dougl. ex Lehm. var. hilgardii (Greene) Munz | OECOH |
| Camissonia hilgardii | Oenothera hilgardii Greene | OEHI |
| Camissonia hirtella | Oenothera hirtella Greene | OEHI2 |
| Camissonia hirtella | Oenothera micrantha Hornem. ex Spreng. var. jonesii (Levl.) Munz | OEMIJ |
| Camissonia ignota | Oenothera ignota (Jepson) Munz | OEIG |
| Camissonia ignota | Oenothera micrantha Hornem. ex Spreng. var. ignota Jepson | OEMII3 |
| Camissonia kernensis ssp. gilmanii | Camissonia kernensis (Munz) Raven var. gilmanii (Munz) Cronq. | CAKEG2 |
| Camissonia kernensis ssp. gilmanii | Oenothera dentata Cav. var. gilmanii Munz | OEDEG |
| Camissonia kernensis ssp. gilmanii | Oenothera kernensis Munz ssp. gilmanii (Munz) Munz | OEKEG |
| Camissonia kernensis ssp. gilmanii | Oenothera kernensis Munz ssp. mojavensis Munz | OEKEM |
| Camissonia kernensis ssp. kernensis | Oenothera kernensis Munz | OEKE2 |
| Camissonia megalantha | Oenothera heterochroma S. Wats. var. megalantha Munz | OEHEM2 |
| Camissonia megalantha | Oenothera megalantha (Munz) Raven | OEME2 |
| Camissonia micrantha | Oenothera micrantha Hornem. ex Spreng. | OEMI4 |
| Camissonia minor | Oenothera minor (A. Nels.) Munz | OEMI6 |
| Camissonia minor | Oenothera minor (A. Nels.) Munz var. cusickii Munz | OEMIC |
| Camissonia minor | Sphaerostigma minor A. Nels. | SPMI4 |
| Camissonia multijuga | Oenothera multijuga S. Wats. | OEMU4 |
| Camissonia multijuga | Oenothera multijuga S. Wats. var. parviflora (S. Wats.) Munz | OEMUP2 |
| Camissonia multijuga | Oenothera multijuga S. Wats. var. typica Munz | OEMUT |
| Camissonia munzii | Oenothera munzii Raven | OEMU3 |
| Camissonia nevadensis | Oenothera nevadensis Kellogg | OENE2 |
| Camissonia ovata | Oenothera ovata Nutt. ex Torr. & Gray | OEOV2 |
| Camissonia pallida ssp. hallii | Oenothera bistorta Nutt. ex Torr. & Gray var. hallii (A. Davids.) Jepson | OEBIH |
| Camissonia pallida ssp. hallii | Oenothera hallii (A. Davids.) Munz | OEHA4 |
| Camissonia pallida ssp. hallii | Sphaerostigma hallii A. Davids. | SPHA4 |
| Camissonia pallida ssp. pallida | Oenothera abramsii J.F. Macbr. | OEAB |
| Camissonia pallida ssp. pallida | Oenothera micrantha Hornem. ex Spreng. var. exfoliata (A. Nels.) Munz | OEMIE |
| Camissonia pallida ssp. pallida | Sphaerostigma pallida Abrams | SPPA9 |
| Camissonia palmeri | Oenothera palmeri S. Wats. | OEPA7 |
| Camissonia parryi | Oenothera parryi S. Wats. | OEPA9 |
| Camissonia parvula | Oenothera parvula Nutt. ex Torr. & Gray | OEPA6 |
| Camissonia pterosperma | Oenothera pterosperma S. Wats. | OEPT2 |
| Camissonia pubens | Oenothera contorta Dougl. ex Lehm. var. pubens (S. Wats.) Coville | OECOP |
| Camissonia pubens | Oenothera pubens (S. Wats.) Munz | OEPU2 |
| Camissonia pubens | Oenothera strigulosa (Fisch. & C.A. Mey.) Torr. & Gray var. pubens S. Wats. | OESTP |
| Camissonia pusilla | Oenothera contorta Dougl. ex Lehm. var. flexuosa (A. Nels.) Munz | OECOF2 |
| Camissonia pygmaea | Oenothera boothii Dougl. ex Lehm. var. pygmaea (Dougl. ex Lehm.) Torr. & Gray | OEBOP |
| Camissonia pygmaea | Oenothera pygmaea Dougl. ex Lehm. | OEPY |
| Camissonia refracta | Oenothera refracta S. Wats. | OERE2 |
| Camissonia scapoidea ssp. brachycarpa | Oenothera scapoidea Nutt. ex Torr. & Gray ssp. brachycarpa Raven | OESCB |
| Camissonia scapoidea ssp. macrocarpa | Camissonia bairdii Welsh | CABA25 |
| Camissonia scapoidea ssp. macrocarpa | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven var. macrocarpa (Raven) Cronq. | CASCM3 |
| Camissonia scapoidea ssp. macrocarpa | Oenothera scapoidea Nutt. ex Torr. & Gray ssp. macrocarpa Raven | OESCM |
| Camissonia scapoidea ssp. scapoidea | Oenothera scapoidea Nutt. ex Torr. & Gray | OESC2 |
| Camissonia scapoidea ssp. scapoidea | Oenothera scapoidea Nutt. ex Torr. & Gray var. seorsa (A. Nels.) Munz | OESCS |
| Camissonia scapoidea ssp. utahensis | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven var. utahensis (Raven) Welsh | CASCU2 |
| Camissonia scapoidea ssp. utahensis | Oenothera scapoidea Nutt. ex Torr. & Gray ssp. utahensis Raven | OESCU |
| Camissonia specuicola ssp. hesperia | Oenothera specuicola Raven ssp. hesperia Raven | OESPH |
| Camissonia specuicola ssp. specuicola | Oenothera specuicola Raven | OESP3 |
| Camissonia strigulosa | Oenothera contorta Dougl. ex Lehm. var. epilobioides (Greene) Munz | OECOE |
| Camissonia strigulosa | Oenothera contorta Dougl. ex Lehm. var. strigulosa (Fisch. & C.A. Mey.) Munz | OECOS |
| Camissonia strigulosa | Oenothera strigulosa (Fisch. & C.A. Mey.) Torr. & Gray | OEST4 |
| Camissonia strigulosa | Sphaerostigma strigulosa Fisch. & C.A. Mey. | SPST5 |
| Camissonia subacaulis | Jussiaea subacaulis Pursh | JUSU6 |
| Camissonia subacaulis | Oenothera heterantha Nutt. | OEHE |
| Camissonia subacaulis | Oenothera subacaulis (Pursh) Garrett | OESU |
| Camissonia tanacetifolia ssp. tanacetifolia | Oenothera tanacetifolia Torr. & Gray | OETA3 |
| Camissonia walkeri ssp. tortilis | Oenothera scapoidea Nutt. ex Torr. & Gray var. tortilis Jepson | OESCT |
| Camissonia walkeri ssp. tortilis | Oenothera walkeri (A. Nels.) Raven ssp. tortilis (Jepson) Raven | OEWAT |
| Camissonia walkeri ssp. walkeri | Clylismia walkeri A. Nels. | CLWA4 |
| Camissonia walkeri ssp. walkeri | Oenothera multijuga S. Wats. var. orientalis Munz | OEMUO |
| Camissonia walkeri ssp. walkeri | Oenothera walkeri (A. Nels.) Raven | OEWA |
| Campo clarkia | Clarkia delicata (Abrams) A. Nels. & J.F. Macbr. | CLDE2 |
| canyon clarkia | Clarkia epilobioides (Nutt. ex Torr. & Gray) A. Nels. & J.F. Macbr. | CLEP |
| Carolina primrose-willow | Ludwigia bonariensis (M. Micheli) Hara | LUBO |
| cavedwelling evening-primrose | Oenothera cavernae Munz | OECA5 |
| Chamerion angustifolium ssp. angustifolium | Chamaenerion angustifolium (L.) Scop. | CHAN80 |
| Chamerion angustifolium ssp. angustifolium | Chamerion angustifolium (L.) Holub var. angustifolium | CHANA3 |
| Chamerion angustifolium ssp. angustifolium | Chamerion spicatum (Lam.) S.F. Gray | CHSP6 |
| Chamerion angustifolium ssp. angustifolium | Epilobium angustifolium L. | EPAN2 |
| Chamerion angustifolium ssp. angustifolium | Epilobium angustifolium L. var. intermedium (Lange) Fern. | EPANI |
| Chamerion angustifolium ssp. angustifolium | Epilobium spicatum Lam. | EPSP2 |
| Chamerion angustifolium ssp. circumvagum | Chamaenerion angustifolium (L.) Scop. ssp. circumvagum (Mosquin) Moldenke | CHANC2 |
| Chamerion angustifolium ssp. circumvagum | Chamerion danielsii D. L?ve | CHDA2 |
| Chamerion angustifolium ssp. circumvagum | Chamerion platyphyllum (Daniels) A.& D. L?ve | CHPL4 |
| Chamerion angustifolium ssp. circumvagum | Epilobium angustifolium L. ssp. circumvagum Mosquin | EPANC |
| Chamerion angustifolium ssp. circumvagum | Epilobium angustifolium L. ssp. macrophyllum (Hausskn.) Hult | EPANM |
| Chamerion angustifolium ssp. circumvagum | Epilobium angustifolium L. var. abbreviatum (Lunell) Munz | EPANA2 |
| Chamerion angustifolium ssp. circumvagum | Epilobium angustifolium L. var. canescens Wood | EPANC2 |
| Chamerion angustifolium ssp. circumvagum | Epilobium angustifolium L. var. macrophyllum (Hausskn.) Fern. | EPANM2 |
| Chamerion angustifolium ssp. circumvagum | Epilobium angustifolium L. var. platyphyllum (Daniels) Fern. | EPANP2 |
| Chamerion latifolium | Chamaenerion latifolium (L.) Sweet | CHLA12 |
| Chamerion latifolium | Chamerion subdentatum (Rydb.) A.& D. L?ve | CHSU11 |
| Chamerion latifolium | Epilobium latifolium L. | EPLA |
| chaparral clarkia | Clarkia affinis H.F. & M.E. Lewis | CLAF |
| chaparral willowherb | Epilobium minutum Lindl. ex Lehm. | EPMI |
| Chilean evening-primrose | Oenothera stricta Ledeb. ex Link | OEST |
| Circaea ?intermedia | Circaea canadensis sensu Fern. | CICA13 |
| Circaea alpina ssp. pacifica | Circaea alpina L. var. pacifica (Aschers. & Magnus) M.E. Jones | CIALP3 |
| Circaea alpina ssp. pacifica | Circaea pacifica Aschers. & Magnus | CIPA10 |
| Circaea lutetiana ssp. canadensis | Circaea canadensis (L.) Hill var. virginiana Fern. | CICAV |
| Circaea lutetiana ssp. canadensis | Circaea latifolia Hill | CILA9 |
| Circaea lutetiana ssp. canadensis | Circaea lutetiana L. var. canadensis L. | CILUC2 |
| Circaea lutetiana ssp. canadensis | Circaea quadrisulcata (Maxim.) Franch. & Savigny ssp. canadensis (L.) A.& D. L?ve | CIQUC3 |
| Circaea lutetiana ssp. canadensis | Circaea quadrisulcata (Maxim.) Franch. & Savigny var. canadensis (L.) Hara | CIQUC2 |
| clarkia | Clarkia Pursh | CLARK |
| Clarkia amoena ssp. amoena | Godetia amoena (Lehm.) G. Don | GOAM |
| Clarkia amoena ssp. caurina | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. var. caurina (Abrams ex Piper) C.L. Hitchc. | CLAMC2 |
| Clarkia amoena ssp. caurina | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. var. pacifica (M.E. Peck) C.L. Hitchc. | CLAMP |
| Clarkia amoena ssp. caurina | Godetia pacifica M.E. Peck | GOPA2 |
| Clarkia amoena ssp. lindleyi | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. var. lindleyi (Dougl.) C.L. Hitchc. | CLAML2 |
| Clarkia amoena ssp. whitneyi | Godetia whitneyi (Gray) T. Moore | GOWH |
| Clarkia arcuata | Godetia hispidula S. Wats. | GOHI6 |
| Clarkia biloba ssp. biloba | Godetia biloba (Dur.) S. Wats. | GOBI4 |
| Clarkia biloba ssp. brandegeeae | Godetia dudleyana Abrams var. brandegeeae Jepson | GODUB |
| Clarkia bottae | Clarkia deflexa (Jepson) H.F. & M.E. Lewis | CLDE3 |
| Clarkia bottae | Godetia bottae Spach | GOBO |
| Clarkia bottae | Godetia bottae Spach var. deflexa (Jepson) C.L. Hitchc. | GOBOD |
| Clarkia cylindrica ssp. cylindrica | Godetia cylindrica (Jepson) C.L. Hitchc. | GOCY2 |
| Clarkia davyi | Godetia quadrivulnera (Dougl. ex Lindl.) Spach var. davyi Jepson | GOQUD |
| Clarkia dudleyana | Godetia dudleyana Abrams | GODU |
| Clarkia epilobioides | Godetia epilobioides (Nutt. ex Torr. & Gray) S. Wats. | GOEP2 |
| Clarkia gracilis ssp. albicaulis | Godetia amoena (Lehm.) G. Don var. albicaulis Jepson | GOAMA |
| Clarkia gracilis ssp. gracilis | Godetia amoena (Lehm.) G. Don var. concolor Jepson | GOAMC |
| Clarkia gracilis ssp. gracilis | Godetia amoena (Lehm.) G. Don var. gracilis (Piper) C.L. Hitchc. | GOAMG |
| Clarkia gracilis ssp. sonomensis | Godetia amoena (Lehm.) G. Don var. sonomensis C.L. Hitchc. | GOAMS |
| Clarkia gracilis ssp. tracyi | Godetia cylindrica (Jepson) C.L. Hitchc. var. tracyi Jepson | GOCYT |
| Clarkia heterandra | Gaura heterandra Torr. | GAHE7 |
| Clarkia heterandra | Heterogaura heterandra (Torr.) Coville | HEHE6 |
| Clarkia lassenensis | Godetia lassenensis Eastw. | GOLA3 |
| Clarkia mosquinii | Clarkia mosquinii E. Small ssp. xerophila E. Small | CLMOX |
| Clarkia purpurea ssp. purpurea | Godetia purpurea (W. Curtis) G. Don | GOPU3 |
| Clarkia purpurea ssp. quadrivulnera | Clarkia quadrivulnera (Dougl. ex Lindl.) A. Nels. & J.F. Macbr. | CLQU |
| Clarkia purpurea ssp. quadrivulnera | Godetia purpurea (W. Curtis) G. Don var. parviflora (S. Wats.) C.L. Hitchc. | GOPUP |
| Clarkia purpurea ssp. quadrivulnera | Godetia quadrivulnera (Dougl. ex Lindl.) Spach | GOQU2 |
| Clarkia purpurea ssp. quadrivulnera | Godetia quadrivulnera (Dougl. ex Lindl.) Spach var. vacensis Jepson | GOQUV |
| Clarkia purpurea ssp. viminea | Clarkia viminea (Dougl. ex Hook.) A. Nels. & J.F. Macbr. | CLVI10 |
| Clarkia purpurea ssp. viminea | Godetia viminea (Dougl. ex Hook.) Spach | GOVI3 |
| Clarkia rubicunda | Clarkia rubicunda (Lindl.) H.F. & M.E. Lewis ssp. blasdalei (Jepson) H.F. & M.E. Lewis | CLRUB |
| Clarkia speciosa ssp. nitens | Clarkia nitens H.F. & M.E. Lewis | CLNI |
| Clarkia speciosa ssp. speciosa | Godetia parviflora (Hook. & Arn.) Jepson | GOPA3 |
| Clarkia speciosa ssp. speciosa | Godetia parviflora (Hook. & Arn.) Jepson var. luteola C.L. Hitchc. | GOPAL |
| Clarkia speciosa ssp. speciosa | Godetia parviflora (Hook. & Arn.) Jepson var. margaritiae (Jepson) C.L. Hitchc. | GOPAM |
| Clarkia tembloriensis ssp. calientensis | Clarkia calientensis Vasek | CLCA4 |
| Clarkia unguiculata | Clarkia elegans Dougl. | CLEL |
| Clarkia williamsonii | Godetia viminea (Dougl. ex Hook.) Spach var. congdonii Jepson | GOVIC |
| Clarkia williamsonii | Godetia viminea (Dougl. ex Hook.) Spach var. incerta Jepson | GOVII |
| Clarkia xantiana ssp. parviflora | Clarkia parviflora Eastw. | CLPA18 |
| Cleland's evening-primrose | Oenothera clelandii W. Dietr., Raven & W.L. Wagner | OECL3 |
| Clementine suncup | Camissonia guadalupensis (S. Wats.) Raven ssp. clementina (Raven) Raven | CAGUC |
| codlins and cream | Epilobium hirsutum L. | EPHI |
| Colorado butterfly plant | Gaura neomexicana Woot. ssp. coloradensis (Rydb.) Raven & Gregory | GANEC |
| Colorado Springs evening-primrose | Oenothera harringtonii W.L. Wagner | OEHA6 |
| common evening-primrose | Oenothera biennis L. | OEBI |
| Cottonwood Springs suncup | Camissonia exilis (Raven) Raven | CAEX10 |
| Coville's groundsmoke | Gayophytum eriospermum Coville | GAER2 |
| creeping primrose-willow | Ludwigia repens J.R. Forst. | LURE2 |
| crownleaf evening-primrose | Oenothera coronopifolia Torr. & Gray | OECO2 |
| Curtiss's evening-primrose | Oenothera curtissii Small | OECU |
| Curtiss's primrose-willow | Ludwigia curtissii Chapman | LUCU4 |
| cutleaf evening-primrose | Oenothera laciniata Hill | OELA |
| cylindricfruit primrose-willow | Ludwigia glandulosa Walt. | LUGL |
| cylindricfruit primrose-willow | Ludwigia glandulosa Walt. ssp. brachycarpa (Torr. & Gray) Peng | LUGLB |
| cylindricfruit primrose-willow | Ludwigia glandulosa Walt. ssp. glandulosa | LUGLG2 |
| Dahurian willowherb | Epilobium davuricum Fisch. ex Hornem. | EPDA |
| Davy's clarkia | Clarkia davyi (Jepson) H.F. & M.E. Lewis | CLDA |
| Death Valley suncup | Camissonia munzii (Raven) Raven | CAMU14 |
| deceptive groundsmoke | Gayophytum decipiens Lewis & Szweykowski | GADE2 |
| Demaree's beeblossom | Gaura demareei Raven & Gregory | GADE |
| denseflower willowherb | Epilobium densiflorum (Lindl.) Hoch & Raven | EPDE4 |
| desert evening-primrose | Oenothera primiveris Gray | OEPR |
| desert evening-primrose | Oenothera primiveris Gray ssp. bufonis (M.E. Jones) Munz | OEPRB |
| desert evening-primrose | Oenothera primiveris Gray ssp. primiveris | OEPRP |
| desert suncup | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. desertorum (Munz) Raven | CABOD2 |
| diamond clarkia | Clarkia rhomboidea Dougl. ex Hook. | CLRH |
| Diamond Valley suncup | Camissonia gouldii Raven | CAGO |
| diffuseflower evening-primrose | Camissonia subacaulis (Pursh) Raven | CASU18 |
| downy willowherb | Epilobium strictum Muhl. ex Spreng. | EPST |
| Drummond's beeblossom | Gaura drummondii (Spach) Torr. & Gray | GADR |
| Dudley's clarkia | Clarkia dudleyana (Abrams) J.F. Macbr. | CLDU |
| dwarf fireweed | Chamerion latifolium (L.) Holub | CHLA13 |
| dwarf groundsmoke | Gayophytum humile Juss. | GAHU2 |
| dwarf suncup | Camissonia pygmaea (Dougl. ex Lehm.) Raven | CAPY5 |
| dwarf willowherb | Epilobium obscurum Schreb. | EPOB3 |
| El Paso evening-primrose | Oenothera coryi W.L. Wagner | OECO3 |
| elegant clarkia | Clarkia unguiculata Lindl. | CLUN |
| enchanter's nightshade | Circaea L. | CIRCA |
| Engelmann's evening-primrose | Oenothera engelmannii (Small) Munz | OEEN |
| Epilobium anagallidifolium | Epilobium alpinum L. p.p. | EPAL |
| Epilobium anagallidifolium | Epilobium anagallidifolium Lam. var. pseudoscaposum (Hausskn.) Hult | EPANP |
| Epilobium arcticum | Epilobium davuricum Fisch. ex Hornem. var. arcticum (Samuelsson) Polunin | EPDAA |
| Epilobium billardierianum ssp. cinereum | Epilobium cinereum A. Rich. | EPCI3 |
| Epilobium brachycarpum | Epilobium paniculatum Nutt. ex T. & G. var. paniculatum Nutt. ex T. & G. [superfluous autonym] | EPPAP |
| Epilobium brachycarpum | Epilobium paniculatum Nutt. ex Torr. & Gray | EPPA2 |
| Epilobium brachycarpum | Epilobium paniculatum Nutt. ex Torr. & Gray var. hammondii (T.J. Howell) M.E. Peck | EPPAH |
| Epilobium brachycarpum | Epilobium paniculatum Nutt. ex Torr. & Gray var. juncundum (Gray) Trel. | EPPAJ |
| Epilobium brachycarpum | Epilobium paniculatum Nutt. ex Torr. & Gray var. laevicaule (Rydb.) Munz | EPPAL |
| Epilobium brachycarpum | Epilobium paniculatum Nutt. ex Torr. & Gray var. subulatum (Hausskn.) Fern. | EPPAS |
| Epilobium brachycarpum | Epilobium paniculatum Nutt. ex Torr. & Gray var. tracyi (Rydb.) Munz | EPPAT |
| Epilobium canum ssp. angustifolium | Zauschneria californica K. Presl | ZACA6 |
| Epilobium canum ssp. angustifolium | Zauschneria californica K. Presl ssp. angustifolia Keck | ZACAA2 |
| Epilobium canum ssp. canum | Epilobium canum (Greene) Raven ssp. mexicanum (K. Presl) Raven | EPCAM |
| Epilobium canum ssp. canum | Zauschneria californica K. Presl ssp. mexicana (K. Presl) Raven | ZACAM |
| Epilobium canum ssp. canum | Zauschneria californica K. Presl var. villosa (Greene) Jepson | ZACAV |
| Epilobium canum ssp. canum | Zauschneria cana Greene | ZACA4 |
| Epilobium canum ssp. garrettii | Epilobium canum (Greene) Raven var. garrettii (A. Nels.) N. & P. Holmgren | EPCAG2 |
| Epilobium canum ssp. garrettii | Zauschneria garrettii A. Nels. | ZAGA2 |
| Epilobium canum ssp. garrettii | Zauschneria latifolia (Hook.) Greene var. garrettii (A. Nels.) Hilend | ZALAG |
| Epilobium canum ssp. latifolium | Epilobium canum (Greene) Raven var. latifolium (Hook.) N. & P. Holmgren | EPCAL2 |
| Epilobium canum ssp. latifolium | Zauschneria californica K. Presl ssp. latifolia (Hook.) Keck | ZACAL2 |
| Epilobium canum ssp. latifolium | Zauschneria latifolia (Hook.) Greene | ZALA2 |
| Epilobium canum ssp. latifolium | Zauschneria latifolia (Hook.) Greene var. arizonica (A. Davids.) Hilend | ZALAA |
| Epilobium ciliatum ssp. ciliatum | Epilobium adenocaulon Hausskn. | EPAD |
| Epilobium ciliatum ssp. ciliatum | Epilobium adenocaulon Hausskn. var. ecomosum (Fassett) Munz | EPADE |
| Epilobium ciliatum ssp. ciliatum | Epilobium adenocaulon Hausskn. var. holosericeum (Trel.) Munz | EPADH |
| Epilobium ciliatum ssp. ciliatum | Epilobium adenocaulon Hausskn. var. parishii (Trel.) Munz | EPADP |
| Epilobium ciliatum ssp. ciliatum | Epilobium adenocaulon Hausskn. var. perplexans Trel. | EPADP2 |
| Epilobium ciliatum ssp. ciliatum | Epilobium americanum Hausskn. | EPAM |
| Epilobium ciliatum ssp. ciliatum | Epilobium brevistylum Barbey | EPBR4 |
| Epilobium ciliatum ssp. ciliatum | Epilobium brevistylum Barbey var. ursinum (Parish ex Trel.) Jepson | EPBRU |
| Epilobium ciliatum ssp. ciliatum | Epilobium californicum Hausskn. | EPCA4 |
| Epilobium ciliatum ssp. ciliatum | Epilobium californicum Hausskn. var. holosericeum (Trel.) Munz | EPCAH |
| Epilobium ciliatum ssp. ciliatum | Epilobium ciliatum Raf. var. ecomosum (Fassett) Boivin | EPCIE |
| Epilobium ciliatum ssp. ciliatum | Epilobium delicatum Trel. | EPDE |
| Epilobium ciliatum ssp. ciliatum | Epilobium ecomosum (Fassett) Fern. | EPEC |
| Epilobium ciliatum ssp. ciliatum | Epilobium glandulosum Lehm. var. adenocaulon (Hausskn.) Fern. | EPGLA |
| Epilobium ciliatum ssp. ciliatum | Epilobium glandulosum Lehm. var. ecomosum Fassett | EPGLE |
| Epilobium ciliatum ssp. ciliatum | Epilobium glandulosum Lehm. var. macounii (Trel.) C.L. Hitchc. | EPGLM2 |
| Epilobium ciliatum ssp. ciliatum | Epilobium leptocarpum Hausskn. var. macounii Trel. | EPLEM |
| Epilobium ciliatum ssp. ciliatum | Epilobium ursinum Parish ex Trel. | EPUR |
| Epilobium ciliatum ssp. ciliatum | Epilobium watsonii Barbey var. parishii (Trel.) C.L. Hitchc. | EPWAP2 |
| Epilobium ciliatum ssp. glandulosum | Epilobium adenocaulon Hausskn. var. cinerascens (Piper) M.E. Peck | EPADC |
| Epilobium ciliatum ssp. glandulosum | Epilobium adenocaulon Hausskn. var. occidentale Trel. | EPADO |
| Epilobium ciliatum ssp. glandulosum | Epilobium boreale Hausskn. | EPBO2 |
| Epilobium ciliatum ssp. glandulosum | Epilobium ciliatum Raf. var. glandulosum (Lehm.) Dorn | EPCIG2 |
| Epilobium ciliatum ssp. glandulosum | Epilobium glandulosum Lehm. | EPGL4 |
| Epilobium ciliatum ssp. glandulosum | Epilobium glandulosum Lehm. var. cardiophyllum Fern. | EPGLC |
| Epilobium ciliatum ssp. glandulosum | Epilobium glandulosum Lehm. var. occidentale (Trel.) Fern. | EPGLO |
| Epilobium ciliatum ssp. glandulosum | Epilobium watsonii Barbey var. occidentale (Trel.) C.L. Hitchc. | EPWAO2 |
| Epilobium ciliatum ssp. watsonii | Epilobium franciscanum Barbey | EPFR |
| Epilobium ciliatum ssp. watsonii | Epilobium watsonii Barbey | EPWA3 |
| Epilobium ciliatum ssp. watsonii | Epilobium watsonii Barbey var. franciscanum (Barbey) Jepson | EPWAF |
| Epilobium clavatum | Epilobium alpinum L. var. albiflorum (Suksdorf) C.L. Hitchc. | EPALA2 |
| Epilobium clavatum | Epilobium alpinum L. var. clavatum (Trel.) C.L. Hitchc. | EPALC2 |
| Epilobium clavatum | Epilobium clavatum Trel. var. glareosum (G.N. Jones) Munz | EPCLG |
| Epilobium clavatum | Epilobium glareosum G.N. Jones | EPGL5 |
| Epilobium cleistogamum | Boisduvalia cleistogama Curran | BOCL |
| Epilobium davuricum | Epilobium palustre L. var. davuricum (Fisch. ex Hornem.) Welsh | EPPAD |
| Epilobium densiflorum | Boisduvalia densiflora (Lindl.) S. Wats. | BODE |
| Epilobium densiflorum | Boisduvalia densiflora (Lindl.) S. Wats. var. pallescens Suksdorf | BODEP |
| Epilobium densiflorum | Boisduvalia densiflora (Lindl.) S. Wats. var. salicina (Nutt. ex Torr. & Gray) Munz | BODES |
| Epilobium densiflorum | Boisduvalia salicina (Nutt. ex Torr. & Gray) Rydb. | BOSA4 |
| Epilobium densiflorum | Oenothera densiflora Lindl. | OEDE6 |
| Epilobium dodonaei | Epilobium angustissimum Weber | EPAN5 |
| Epilobium foliosum | Epilobium minutum Lindl. ex Lehm. var. foliosum Torr. & Gray | EPMIF |
| Epilobium glaberrimum ssp. fastigiatum | Epilobium glaberrimum Barbey var. fastigiatum (Nutt.) Trel. ex Jepson | EPGLF2 |
| Epilobium glaberrimum ssp. fastigiatum | Epilobium platyphyllum Rydb. | EPPL |
| Epilobium halleanum | Epilobium brevistylum Barbey var. subfalcatum (Trel.) Munz | EPBRS |
| Epilobium halleanum | Epilobium brevistylum Barbey var. tenue (Trel.) Jepson | EPBRT |
| Epilobium halleanum | Epilobium glandulosum Lehm. var. tenue (Trel.) C.L. Hitchc. | EPGLT2 |
| Epilobium halleanum | Epilobium pringleanum Hausskn. | EPPR |
| Epilobium halleanum | Epilobium pringleanum Hausskn. var. tenue (Trel.) Munz | EPPRT |
| Epilobium hornemannii ssp. behringianum | Epilobium alpinum L. var. sertulatum (Hausskn.) Welsh | EPALS |
| Epilobium hornemannii ssp. behringianum | Epilobium behringianum Hausskn. | EPBE3 |
| Epilobium hornemannii ssp. behringianum | Epilobium sertulatum Hausskn. | EPSE4 |
| Epilobium hornemannii ssp. hornemannii | Epilobium alpinum L. var. nutans Hornem. | EPALN |
| Epilobium lactiflorum | Epilobium alpinum L. var. lactiflorum (Hausskn.) C.L. Hitchc. | EPALL2 |
| Epilobium lactiflorum | Epilobium hornemannii Reichenb. var. lactiflorum (Hausskn.) D. L?ve | EPHOL |
| Epilobium leptophyllum | Epilobium nesophilum (Fern.) Fern. | EPNE3 |
| Epilobium leptophyllum | Epilobium nesophilum (Fern.) Fern. var. sabulonense Fern. | EPNES |
| Epilobium leptophyllum | Epilobium palustre L. var. gracile (Farw.) Dorn | EPPAG |
| Epilobium leptophyllum | Epilobium palustre L. var. sabulonense (Fern.) Boivin | EPPAS2 |
| Epilobium leptophyllum | Epilobium rosmarinifolium Pursh | EPRO |
| Epilobium leptophyllum | Epilobium treleaseanum Levl. p.p. | EPTR2 |
| Epilobium luteum | Epilobium treleaseanum Levl. p.p. | EPTR2 |
| Epilobium oreganum | Epilobium exaltatum E. Drew | EPEX2 |
| Epilobium oregonense | Epilobium alpinum L. var. gracillimum (Trel.) C.L. Hitchc. | EPALG |
| Epilobium pallidum | Boisduvalia macrantha Heller | BOMA |
| Epilobium pallidum | Boisduvalia pallida Eastw. | BOPA3 |
| Epilobium palustre | Epilobium lineare Muhl. | EPLI |
| Epilobium palustre | Epilobium oliganthum Michx. | EPOL |
| Epilobium palustre | Epilobium palustre L. var. grammadophyllum Hausskn. | EPPAG2 |
| Epilobium palustre | Epilobium palustre L. var. labradoricum Hausskn. | EPPAL4 |
| Epilobium palustre | Epilobium palustre L. var. lapponicum Wahlenb. | EPPAL3 |
| Epilobium palustre | Epilobium palustre L. var. longirameum Fern. & Wieg. | EPPAL2 |
| Epilobium palustre | Epilobium palustre L. var. oliganthum (Michx.) Fern. | EPPAO |
| Epilobium palustre | Epilobium pylaieanum Fern. | EPPY |
| Epilobium palustre | Epilobium wyomingense A. Nels. | EPWY |
| Epilobium pygmaeum | Boisduvalia glabella (Nutt.) Walp. | BOGL |
| Epilobium pygmaeum | Boisduvalia glabella (Nutt.) Walp. var. campestris (Jepson) Jepson | BOGLC |
| Epilobium pygmaeum | Boisduvalia pygmaea (Speg.) Munz | BOPY |
| Epilobium pygmaeum | Oenothera glabella Nutt. | OEGL2 |
| Epilobium rigidum | Epilobium rigidum Hausskn. var. canescens Trel. | EPRIC |
| Epilobium saximontanum | Epilobium drummondii Hausskn. | EPDR |
| Epilobium saximontanum | Epilobium glandulosum Lehm. var. brionense Fern. | EPGLB |
| Epilobium saximontanum | Epilobium scalare Fern. | EPSC |
| Epilobium saximontanum | Epilobium steckerianum Fern. | EPST3 |
| Epilobium septentrionale | Epilobium canum (Greene) Raven ssp. septentrionale (Keck) Raven | EPCAS |
| Epilobium septentrionale | Zauschneria septentrionalis Keck | ZASE3 |
| Epilobium siskiyouense | Epilobium obcordatum Gray ssp. siskiyouense Munz | EPOBS |
| Epilobium siskiyouense | Epilobium obcordatum Gray var. laxum (Hausskn.) Dempster ex Jepson | EPOBL |
| Epilobium strictum | Epilobium densum Raf. | EPDE2 |
| Epilobium torreyi | Boisduvalia stricta (Gray) Greene | BOST |
| Epilobium torreyi | Gayophytum strictum Gray | GAST5 |
| Eureka Dunes evening-primrose | Oenothera californica (S. Wats.) S. Wats. ssp. eurekensis (Munz & Roos) W. Klein | OECAE2 |
| evening-primrose | Oenothera L. | OENOT |
| fairy fans | Clarkia breweri (Gray) Greene | CLBR |
| false gaura | Stenosiphon linifolius (Nutt. ex James) Heynh. | STLI2 |
| farewell to spring | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. | CLAM |
| farewell to spring | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. ssp. amoena | CLAMA |
| farewell to spring | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. ssp. caurina (Abrams ex Piper) H.F. & M.E. Lewis | CLAMC |
| farewell to spring | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. ssp. huntiana (Jepson) H.F. & M.E. Lewis | CLAMH |
| fewflower evening-primrose | Camissonia breviflora (Torr. & Gray) Raven | CABR22 |
| fireweed | Chamerion angustifolium (L.) Holub | CHAN9 |
| fireweed | Chamerion angustifolium (L.) Holub ssp. angustifolium | CHANA2 |
| fireweed | Chamerion angustifolium (L.) Holub ssp. circumvagum (Mosquin) Hoch | CHANC |
| fireweed | Chamerion Raf. ex Holub | CHAME2 |
| Flaming Gorge evening-primrose | Oenothera acutissima W.L. Wagner | OEAC |
| floating primrose-willow | Ludwigia peploides (Kunth) Raven | LUPE5 |
| floating primrose-willow | Ludwigia peploides (Kunth) Raven ssp. glabrescens (Kuntze) Raven | LUPEG2 |
| floating primrose-willow | Ludwigia peploides (Kunth) Raven ssp. montevidensis (Spreng.) Raven | LUPEM |
| floating primrose-willow | Ludwigia peploides (Kunth) Raven ssp. peploides | LUPEP2 |
| Fort Huachuca evening-primrose | Oenothera platanorum Raven & Parnell | OEPL |
| Fort Miller clarkia | Clarkia williamsonii (Dur. & Hilg.) H.F. & M.E. Lewis | CLWI |
| Fortuna Range suncup | Camissonia arenaria (A. Nels.) Raven | CAAR20 |
| fourpoint evening-primrose | Oenothera rhombipetala Nutt. ex Torr. & Gray | OERH |
| fourwing evening-primrose | Oenothera tetraptera Cav. | OETE2 |
| Fremont's evening-primrose | Oenothera macrocarpa Nutt. ssp. fremontii (S. Wats.) W.L. Wagner | OEMAF |
| fringed willowherb | Epilobium ciliatum Raf. | EPCI |
| fringed willowherb | Epilobium ciliatum Raf. ssp. ciliatum | EPCIC |
| fringed willowherb | Epilobium ciliatum Raf. ssp. glandulosum (Lehm.) Hoch & Raven | EPCIG |
| fringed willowherb | Epilobium ciliatum Raf. ssp. watsonii (Barbey) Hoch & Raven | EPCIW |
| froststem suncup | Camissonia multijuga (S. Wats.) Raven | CAMU13 |
| fuchsia | Fuchsia L. | FUCHS |
| Fuchsia magellanica var. macrostema | Fuchsia gracilis Lindl. [excluded] | FUGR2 |
| Fuchsia magellanica var. macrostema | Fuchsia macrostema Ruiz & Pav?n [excluded] | FUMA5 |
| Garrett's firechalice | Epilobium canum (Greene) Raven ssp. garrettii (A. Nels.) Raven | EPCAG |
| Gaura angustifolia | Gaura eatonii Small | GAEA |
| Gaura angustifolia | Gaura simulans Small | GASI4 |
| Gaura brachycarpa | Gaura hexandra Ortega var. coryi (Munz) Munz | GAHEC |
| Gaura brachycarpa | Gaura tripetala Cav. var. coryi Munz | GATRC2 |
| Gaura coccinea | Gaura coccinea Nutt. ex Pursh var. arizonica Munz | GACOA |
| Gaura coccinea | Gaura coccinea Nutt. ex Pursh var. epilobioides (Kunth) Munz | GACOE3 |
| Gaura coccinea | Gaura coccinea Nutt. ex Pursh var. glabra (Lehm.) Munz | GACOG2 |
| Gaura coccinea | Gaura coccinea Nutt. ex Pursh var. parvifolia (Torr.) Rickett | GACOP2 |
| Gaura coccinea | Gaura coccinea Nutt. ex Pursh var. typica Munz | GACOT |
| Gaura coccinea | Gaura glabra Lehm. | GAGL5 |
| Gaura coccinea | Gaura odorata Sess? ex Lag. | GAOD2 |
| Gaura filipes | Gaura filipes Spach var. major Torr. & Gray | GAFIM |
| Gaura filipes | Gaura michauxii Spach | GAMI7 |
| Gaura hexandra ssp. gracilis | Gaura gracilis Woot. & Standl. | GAGR9 |
| Gaura hexandra ssp. gracilis | Gaura gracilis Woot. & Standl. var. typica Munz | GAGRT |
| Gaura hexandra ssp. hexandra | Gaura tripetala Cav. [excluded] | GATR11 |
| Gaura longiflora | Gaura biennis L. var. pitcheri Torr. & Gray | GABIP |
| Gaura longiflora | Gaura filiformis Small | GAFI4 |
| Gaura longiflora | Gaura pitcheri (Torr. & Gray) Small | GAPI5 |
| Gaura mckelveyae | Gaura villosa Torr. var. mckelveyae Munz | GAVIM |
| Gaura mollis | Gaura parviflora Dougl. ex Lehm. | GAPA6 |
| Gaura mollis | Gaura parviflora Dougl. ex Lehm. var. lachnocarpa Weatherby | GAPAL |
| Gaura mollis | Gaura parviflora Dougl. ex Lehm. var. typica Munz | GAPAT3 |
| Gaura neomexicana ssp. coloradensis | Gaura neomexicana Woot. var. coloradensis (Rydb.) Munz | GANEC2 |
| Gaura neomexicana ssp. neomexicana | Gaura neomexicana Woot. var. typica Munz | GANET |
| Gaura suffulta ssp. nealleyi | Gaura nealleyi Coult. | GANE4 |
| Gaura triangulata | Gaura hexandra Ortega var. triangulata (Buck.) Munz | GAHET |
| Gaura triangulata | Gaura tripetala Cav. var. triangulata (Buckl.) Munz | GATRT4 |
| Gaura villosa ssp. parksii | Gaura villosa Torr. var. parksii Munz | GAVIP2 |
| Gaura villosa ssp. villosa | Gaura villosa Torr. var. arenicola Munz | GAVIA |
| Gaura villosa ssp. villosa | Gaura villosa Torr. var. typica Munz | GAVIT |
| Gayophytum diffusum ssp. parviflorum | Gayophytum diffusum Torr. & Gray var. strictipes (Hook.) Dorn | GADIS |
| Gayophytum diffusum ssp. parviflorum | Gayophytum helleri Rydb. var. erosulatum Jepson | GAHEE |
| Gayophytum diffusum ssp. parviflorum | Gayophytum intermedium Rydb. | GAIN6 |
| Gayophytum diffusum ssp. parviflorum | Gayophytum lasiospermum Greene | GALA12 |
| Gayophytum diffusum ssp. parviflorum | Gayophytum lasiospermum Greene var. hoffmannii Munz | GALAH3 |
| Gayophytum diffusum ssp. parviflorum | Gayophytum nuttallii Torr. & Gray var. abramsii Munz | GANUA |
| Gayophytum diffusum ssp. parviflorum | Gayophytum nuttallii Torr. & Gray var. intermedium (Rydb.) Munz | GANUI2 |
| Gayophytum heterozygum | Gayophytum diffusum Torr. & Gray var. villosum Munz | GADIV |
| Gayophytum humile | Gayophytum nuttallii Torr. & Gray | GANU3 |
| Gayophytum racemosum | Gayophytum helleri Rydb. | GAHE6 |
| Gayophytum racemosum | Gayophytum helleri Rydb. var. glabrum Munz | GAHEG2 |
| Gayophytum racemosum | Gayophytum humile Juss. var. hirtellum Munz | GAHUH |
| Gayophytum racemosum | Gayophytum racemosum Torr. & Gray var. caesium (Torr. & Gray) Munz | GARAC |
| Gilman's evening-primrose | Camissonia kernensis (Munz) Raven ssp. gilmanii (Munz) Raven | CAKEG |
| glandular clarkia | Clarkia arcuata (Kellogg) A. Nels. & J.F. Macbr. | CLAR |
| glandular willowherb | Epilobium halleanum Hausskn. | EPHA |
| glaucus willowherb | Epilobium glaberrimum Barbey | EPGL |
| glaucus willowherb | Epilobium glaberrimum Barbey ssp. fastigiatum (Nutt.) Hoch & Raven | EPGLF |
| glaucus willowherb | Epilobium glaberrimum Barbey ssp. glaberrimum | EPGLG |
| globefruit primrose-willow | Ludwigia sphaerocarpa Ell. | LUSP |
| golden suncup | Camissonia brevipes (Gray) Raven ssp. arizonica (Raven) Raven | CABRA |
| golden suncup | Camissonia brevipes (Gray) Raven ssp. brevipes | CABRB4 |
| goldeneggs | Camissonia ovata (Nutt. ex Torr. & Gray) Raven | CAOV4 |
| Grand Canyon suncup | Camissonia confertiflora (Raven) Raven | CACO32 |
| Grand Junction camissonia | Camissonia eastwoodiae (Munz) Raven | CAEA |
| Grants Pass willowherb | Epilobium oreganum Greene | EPOR |
| grassland suncup | Camissonia lacustris Raven | CALA39 |
| groundsmoke | Gayophytum A. Juss. | GAYOP |
| Guadalupe suncup | Camissonia guadalupensis (S. Wats.) Raven | CAGU4 |
| gunsight clarkia | Clarkia xantiana Gray | CLXA |
| gunsight clarkia | Clarkia xantiana Gray ssp. xantiana | CLXAX |
| hairy evening-primrose | Oenothera villosa Thunb. | OEVI |
| hairy evening-primrose | Oenothera villosa Thunb. ssp. strigosa (Rydb.) W. Dietr. & Raven | OEVIS |
| hairy evening-primrose | Oenothera villosa Thunb. ssp. villosa | OEVIV |
| hairy primrose-willow | Ludwigia pilosa Walt. | LUPI |
| hairy suncup | Camissonia pubens (S. Wats.) Raven | CAPU15 |
| Hall's suncup | Camissonia pallida (Abrams) Raven ssp. hallii (A. Davids.) Raven | CAPAH2 |
| Hardham's evening-primrose | Camissonia hardhamiae Raven | CAHA15 |
| hardy fuchsia | Fuchsia magellanica Lam. | FUMA |
| harlequinbush | Gaura hexandra Ortega | GAHE2 |
| harlequinbush | Gaura hexandra Ortega ssp. gracilis (Woot. & Standl.) Raven & Gregory | GAHEG |
| harlequinbush | Gaura hexandra Ortega ssp. hexandra Ortega [excluded] | GAHEH |
| Hartweg's sundrops | Calylophus hartwegii (Benth.) Raven | CAHA14 |
| Hartweg's sundrops | Calylophus hartwegii (Benth.) Raven ssp. fendleri (Gray) Towner & Raven | CAHAF |
| Hartweg's sundrops | Calylophus hartwegii (Benth.) Raven ssp. filifolius (Eastw.) Towner & Raven | CAHAF2 |
| Hartweg's sundrops | Calylophus hartwegii (Benth.) Raven ssp. hartwegii | CAHAH |
| Hartweg's sundrops | Calylophus hartwegii (Benth.) Raven ssp. pubescens (Gray) Towner & Raven | CAHAP |
| Havard's evening-primrose | Oenothera havardii S. Wats. | OEHA2 |
| heartleaf evening-primrose | Oenothera cordata J.W. Loudon | OECO6 |
| heartleaf suncup | Camissonia cardiophylla (Torr.) Raven | CACA34 |
| heartleaf suncup | Camissonia cardiophylla (Torr.) Raven ssp. cardiophylla | CACAC9 |
| heartleaf suncup | Camissonia cardiophylla (Torr.) Raven ssp. robusta (Raven) Raven | CACAR2 |
| Hilgard's suncup | Camissonia hilgardii (Greene) Raven | CAHI12 |
| hill suncup | Camissonia graciliflora (Hook. & Arn.) Raven | CAGR14 |
| Hooker's evening-primrose | Oenothera elata Kunth | OEEL |
| Hooker's evening-primrose | Oenothera elata Kunth ssp. hirsutissima (Gray ex S. Wats.) W. Dietr. | OEELH |
| Hooker's evening-primrose | Oenothera elata Kunth ssp. hookeri (Torr. & Gray) W. Dietr. & W.L. Wagner | OEELH2 |
| Hornemann's willowherb | Epilobium hornemannii Reichenb. | EPHO |
| Hornemann's willowherb | Epilobium hornemannii Reichenb. ssp. behringianum (Hausskn.) Hoch & Raven | EPHOB |
| Hornemann's willowherb | Epilobium hornemannii Reichenb. ssp. hornemannii | EPHOH |
| Howard's evening-primrose | Oenothera howardii (A. Nels.) W.L. Wagner | OEHO2 |
| hummingbird trumpet | Epilobium canum (Greene) Raven | EPCA3 |
| hummingbird trumpet | Epilobium canum (Greene) Raven ssp. angustifolium (Keck) Raven | EPCAA |
| hummingbird trumpet | Epilobium canum (Greene) Raven ssp. canum | EPCAC2 |
| hummingbird trumpet | Epilobium canum (Greene) Raven ssp. latifolium (Hook.) Raven | EPCAL |
| hybrid fuchsia | Fuchsia hybrida hort. ex Sieb. & Voss | FUHY2 |
| intermediate suncup | Camissonia intermedia Raven | CAIN23 |
| Jolon clarkia | Clarkia jolonensis Parnell | CLJO2 |
| Jurupa Hills suncup | Camissonia ignota (Jepson) Raven | CAIG2 |
| Kaibab suncup | Camissonia specuicola (Raven) Raven | CASP13 |
| Kaibab suncup | Camissonia specuicola (Raven) Raven ssp. hesperia (Raven) Raven | CASPH |
| Kaibab suncup | Camissonia specuicola (Raven) Raven ssp. specuicola | CASPS3 |
| Kern Canyon clarkia | Clarkia xantiana Gray ssp. parviflora (Eastw.) H.F. Lewis & Raven | CLXAP |
| Kern County evening-primrose | Camissonia kernensis (Munz) Raven | CAKE4 |
| Kern County evening-primrose | Camissonia kernensis (Munz) Raven ssp. kernensis | CAKEK |
| Kern River clarkia | Clarkia exilis Lewis & Vasek | CLEX |
| Kern River evening-primrose | Camissonia integrifolia Raven | CAIN22 |
| kisses | Gaura suffulta Engelm. ex Gray | GASU2 |
| kisses | Gaura suffulta Engelm. ex Gray ssp. suffulta | GASUS |
| Kunth's evening-primrose | Oenothera kunthiana (Spach) Munz | OEKU |
| Lake Almanor clarkia | Clarkia stellata Mosquin | CLST3 |
| lanceleaf browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. lancifolia (Heller) Raven | CACLL |
| lanceleaf primrose-willow | Ludwigia lanceolata Ell. | LULA6 |
| large-flower primrose-willow | Ludwigia grandiflora (M. Micheli) Greuter & Burdet | LUGR9 |
| large-flower primrose-willow | Ludwigia grandiflora (M. Micheli) Greuter & Burdet ssp. grandiflora | LUGRG2 |
| largeflower evening-primrose | Oenothera grandiflora L'H?r. ex Ait. | OEGR4 |
| largeflower spike-primrose | Epilobium pallidum (Eastw.) Hoch & Raven | EPPA7 |
| largeflower suncup | Camissonia megalantha (Munz) Raven | CAME16 |
| lavenderleaf sundrops | Calylophus lavandulifolius (Torr. & Gray) Raven | CALA38 |
| Lewis River suncup | Camissonia parvula (Nutt. ex Torr. & Gray) Raven | CAPA39 |
| Lewis's clarkia | Clarkia lewisii Raven & Parnell | CLLE2 |
| Lewis's evening-primrose | Camissonia lewisii Raven | CALE26 |
| Lindheimer's beeblossom | Gaura lindheimeri Engelm. & Gray | GALI2 |
| Lindley's clarkia | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. ssp. lindleyi (Dougl.) H.F. & M.E. Lewis | CLAML |
| little evening-primrose | Oenothera perennis L. | OEPE |
| little wiry suncup | Camissonia pusilla Raven | CAPU16 |
| Long Beach primrose-willow | Ludwigia brevipes (B.H. Long ex Britt., A. Braun & Small) Eames | LUBR |
| longcapsule suncup | Camissonia chamaenerioides (Gray) Raven | CACH12 |
| longflower beeblossom | Gaura longiflora Spach | GALO3 |
| longflower evening-primrose | Oenothera affinis Camb. | OEAF |
| longleaf primrose-willow | Ludwigia longifolia (DC.) Hara | LULO2 |
| longstem evening-primrose | Oenothera longissima Rydb. | OELO |
| Ludwigia alata | Ludwigia simulata Small | LUSI7 |
| Ludwigia alternifolia | Ludwigia alternifolia L. var. linearifolia Britt. | LUALL |
| Ludwigia alternifolia | Ludwigia alternifolia L. var. pubescens Palmer & Steyermark | LUALP |
| Ludwigia alternifolia | Ludwigia alternifolia L. var. typica Munz | LUALT |
| Ludwigia arcuata | Ludwigiantha arcuata (Walt.) Small | LUAR15 |
| Ludwigia bonariensis | Jussiaea neglecta Small | 4-Jun |
| Ludwigia brevipes | Ludwigiantha brevipes B.H. Long ex Britt., A. Braun & Small | LUBR8 |
| Ludwigia curtissii | Ludwigia spathulifolia Small | LUSP7 |
| Ludwigia decurrens | Jussiaea decurrens (Walt.) DC. | JUDE5 |
| Ludwigia erecta | Jussiaea erecta L. | JUER2 |
| Ludwigia glandulosa ssp. brachycarpa | Ludwigia cylindrica Ell. var. brachycarpa Torr. & Gray | LUCYB |
| Ludwigia glandulosa ssp. glandulosa | Ludwigia glandulosa Walt. var. torreyi Munz | LUGLT |
| Ludwigia glandulosa ssp. glandulosa | Ludwigia glandulosa Walt. var. typica Munz | LUGLT2 |
| Ludwigia grandiflora ssp. grandiflora | Jussiaea grandiflora Michx., non Ruiz & Pav?n | JUGR5 |
| Ludwigia grandiflora ssp. grandiflora | Jussiaea michauxiana Fern. (excl. type) | JUMI4 |
| Ludwigia grandiflora ssp. grandiflora | Jussiaea repens L. var. grandiflora M. Micheli | JUREG3 |
| Ludwigia grandiflora ssp. grandiflora | Jussiaea uruguayensis Camb. | JUUR2 |
| Ludwigia grandiflora ssp. grandiflora | Ludwigia uruguayensis (Camb.) Hara | LUUR |
| Ludwigia grandiflora ssp. grandiflora | Ludwigia uruguayensis (Camb.) Hara var. major (Hassler) Munz | LUURM |
| Ludwigia grandiflora ssp. hexapetala | Ludwigia hexapetala (Hook. & Arn.) Zardini, Gu & Raven | LUHE5 |
| Ludwigia leptocarpa | Jussiaea leptocarpa Nutt. | JULE5 |
| Ludwigia leptocarpa | Ludwigia leptocarpa (Nutt.) Hara var. meyeriana (Kuntze) Alain | LULEM4 |
| Ludwigia linearis | Ludwigia linearis Walt. var. puberula Engelm. & Gray | LULIP |
| Ludwigia octovalvis ssp. octovalvis | Jussiaea angustifolia Lam. | JUAN2 |
| Ludwigia octovalvis ssp. octovalvis | Jussiaea clavata (K. Presl) M.E. Jones | JUCL |
| Ludwigia octovalvis ssp. octovalvis | Jussiaea octofila DC. | JUOC3 |
| Ludwigia octovalvis ssp. octovalvis | Jussiaea suffruticosa Walt. var. octofila (DC.) Munz | JUSUO |
| Ludwigia octovalvis ssp. octovalvis | Ludwigia octovalvis (Jacq.) Raven var. ligustrifolia (Kunth) Alain | LUOCL |
| Ludwigia octovalvis ssp. octovalvis | Ludwigia octovalvis (Jacq.) Raven var. macropoda (K. Presl) Shinners | LUOCM |
| Ludwigia octovalvis ssp. octovalvis | Ludwigia octovalvis (Jacq.) Raven var. octofila (DC.) Alain | LUOCO2 |
| Ludwigia octovalvis ssp. sessiliflora | Jussiaea scabra Willd. | JUSC3 |
| Ludwigia octovalvis ssp. sessiliflora | Ludwigia octovalvis (Jacq.) Raven var. sessiliflora (M. Micheli) Shinners | LUOCS2 |
| Ludwigia palustris | Isnardia palustris L., non Jussiaea palustris G.F.W. Mey. | ISPA4 |
| Ludwigia palustris | Ludwigia palustris (L.) Ell. var. americana (DC.) Fern. & Grisc. | LUPAA2 |
| Ludwigia palustris | Ludwigia palustris (L.) Ell. var. nana Fern. & Grisc. | LUPAN |
| Ludwigia palustris | Ludwigia palustris (L.) Ell. var. pacifica Fern. & Grisc. | LUPAP3 |
| Ludwigia peploides ssp. glabrescens | Jussiaea diffusa auct. non Forssk. [misapplied] | JUDI4 |
| Ludwigia peploides ssp. glabrescens | Jussiaea repens L. | JURE6 |
| Ludwigia peploides ssp. glabrescens | Jussiaea repens L. var. glabrescens Kuntze | JUREG2 |
| Ludwigia peploides ssp. glabrescens | Ludwigia peploides (Kunth) Raven var. glabrescens (Kuntze) Shinners | LUPEG4 |
| Ludwigia peploides ssp. montevidensis | Jussiaea repens L. var. montevidensis (Spreng.) Munz | JUREM2 |
| Ludwigia peploides ssp. montevidensis | Ludwigia peploides (Kunth) Raven var. montevidensis (Spreng.) Shinners | LUPEM2 |
| Ludwigia peploides ssp. peploides | Jussiaea peploides Kunth | JUPE5 |
| Ludwigia peploides ssp. peploides | Jussiaea repens L. var. peploides (Kunth) Griseb. | JUREP2 |
| Ludwigia peruviana | Jussiaea peruviana L. | JUPE6 |
| Ludwigia repens | Isnardia intermedia Small & Alexander | ISIN2 |
| Ludwigia repens | Isnardia repens (J.R. Forst.) DC. | ISRE3 |
| Ludwigia repens | Ludwigia natans Ell. | LUNA4 |
| Ludwigia repens | Ludwigia natans Ell. var. stipitata Fern. & Grisc. | LUNAS2 |
| Ludwigia repens | Ludwigia repens J.R. Forst. var. rotundata (Griseb.) Gomes | LURER |
| Ludwigia repens | Ludwigia repens J.R. Forst. var. stipitata (Fern. & Grisc.) Munz | LURES |
| Ludwigia spathulata | Isnardia spathulata (Torr. & Gray) Small | ISSP |
| Ludwigia sphaerocarpa | Ludwigia sphaerocarpa Ell. var. deamii Fern. & Grisc. | LUSPD |
| Ludwigia sphaerocarpa | Ludwigia sphaerocarpa Ell. var. jungens Fern. & Grisc. | LUSPJ |
| Ludwigia sphaerocarpa | Ludwigia sphaerocarpa Ell. var. macrocarpa Fern. & Grisc. | LUSPM2 |
| MacCart's sundrops | Calylophus hartwegii (Benth.) Raven ssp. maccartii (Shinners) Towner & Raven | CAHAM |
| manyfruit primrose-willow | Ludwigia polycarpa Short & Peter | LUPO |
| Mariposa clarkia | Clarkia biloba (Dur.) A. Nels. & J.F. Macbr. ssp. australis H.F. & M.E. Lewis | CLBIA |
| marsh seedbox | Ludwigia palustris (L.) Ell. | LUPA |
| marsh willowherb | Epilobium palustre L. | EPPA |
| Mckelvey's beeblossom | Gaura mckelveyae (Munz) Raven & Gregory | GAMC |
| meadow evening-primrose | Oenothera pilosella Raf. | OEPI2 |
| meadow evening-primrose | Oenothera pilosella Raf. ssp. pilosella | OEPIP |
| meadow evening-primrose | Oenothera pilosella Raf. ssp. sessilis (Pennell) Straley | OEPIS |
| Merced clarkia | Clarkia lingulata H.F. & M.E. Lewis | CLLI |
| Mexican evening-primrose | Oenothera mexicana Spach | OEME |
| Mexican primrose-willow | Ludwigia octovalvis (Jacq.) Raven | LUOC |
| Mexican primrose-willow | Ludwigia octovalvis (Jacq.) Raven ssp. octovalvis | LUOCO |
| Mexican primrose-willow | Ludwigia octovalvis (Jacq.) Raven ssp. sessiliflora (M. Micheli) Raven | LUOCS |
| Mildred's clarkia | Clarkia mildrediae (Heller) H.F. & M.E. Lewis | CLMI |
| Mildred's clarkia | Clarkia mildrediae (Heller) H.F. & M.E. Lewis ssp. lutescens Gottlieb & L.P. Janeway | CLMIL3 |
| Mildred's clarkia | Clarkia mildrediae (Heller) H.F. & M.E. Lewis ssp. mildrediae | CLMIM |
| milkflower willowherb | Epilobium lactiflorum Hausskn. | EPLA3 |
| miniature suncup | Camissonia micrantha (Hornem. ex Spreng.) Raven | CAMI22 |
| Mojave suncup | Camissonia campestris (Greene) Raven | CACA33 |
| Mojave suncup | Camissonia campestris (Greene) Raven ssp. campestris | CACAC8 |
| Mono Hot Springs evening-primrose | Camissonia sierrae Raven ssp. alticola Raven | CASIA |
| Mosquin's clarkia | Clarkia mosquinii E. Small | CLMO3 |
| mountain clarkia | Clarkia heterandra (Torr.) Lewis & Raven | CLHE4 |
| mountain evening-primrose | Oenothera latifolia (Rydb.) Munz | OELA2 |
| Mt. Lassen clarkia | Clarkia lassenensis (Eastw.) H.F. & M.E. Lewis | CLLA |
| Murdock's evening-primrose | Oenothera murdockii Welsh & Atwood | OEMU5 |
| narrowleaf evening-primrose | Oenothera fruticosa L. | OEFR |
| narrowleaf evening-primrose | Oenothera fruticosa L. ssp. fruticosa | OEFRF |
| narrowleaf evening-primrose | Oenothera fruticosa L. ssp. glauca (Michx.) Straley | OEFRG |
| narrowleaf primrose-willow | Ludwigia linearis Walt. | LULI |
| narrowleaf suncup | Camissonia refracta (S. Wats.) Raven | CARE2 |
| Navajo evening-primrose | Oenothera caespitosa Nutt. ssp. navajoensis W.L. Wagner, Stockhouse & Klein | OECAN |
| Nealley's kisses | Gaura suffulta Engelm. ex Gray ssp. nealleyi (Coult.) Raven & Gregory | GASUN |
| Nevada suncup | Camissonia nevadensis (Kellogg) Raven | CANE11 |
| Nevada willowherb | Epilobium nevadense Munz | EPNE2 |
| New Mexico beeblossom | Gaura neomexicana Woot. | GANE2 |
| New Mexico beeblossom | Gaura neomexicana Woot. ssp. neomexicana | GANEN |
| New Mexico evening-primrose | Oenothera neomexicana (Small) Munz | OENE |
| nodding evening-primrose | Oenothera nutans Atkinson & Bartlett | OENU2 |
| northern clarkia | Clarkia borealis E. Small | CLBO4 |
| northern clarkia | Clarkia borealis E. Small ssp. borealis | CLBOB |
| northern evening-primrose | Oenothera parviflora L. | OEPA5 |
| northern willowherb | Epilobium septentrionale (Keck) R.N. Bowman & Hoch | EPSE3 |
| Nuttall's evening-primrose | Oenothera nuttallii Sweet | OENU |
| Oakes's evening-primrose | Oenothera oakesiana (Gray) J.W. Robbins ex S. Wats. & Coult. | OEOA |
| Obispo suncup | Camissonia campestris (Greene) Raven ssp. obispoensis Raven | CACAO |
| Oenothera acutissima | Oenothera flava (A. Nels.) Garrett var. acutissima (W.L. Wagner) Welsh | OEFLA |
| Oenothera albicaulis | Anogra albicaulis (Pursh) Britt. | ANAL8 |
| Oenothera albicaulis | Oenothera ctenophylla (Woot. & Standl.) Tidestrom | OECT |
| Oenothera argillicola | Oenothera argillicola Mackenzie var. pubescens Core & Davis | OEARP |
| Oenothera arizonica | Oenothera avita (W. Klein) W. Klein ssp. arizonica (Munz) W. Klein | OEAVA |
| Oenothera arizonica | Oenothera californica (S. Wats.) S. Wats. ssp. arizonica (Munz) W. Klein | OECAA3 |
| Oenothera arizonica | Oenothera deltoides Torr. & Fr?m. var. arizonica Munz | OEDEA2 |
| Oenothera biennis | Oenothera biennis L. ssp. caeciarum Munz | OEBIC |
| Oenothera biennis | Oenothera biennis L. ssp. centralis Munz | OEBIC3 |
| Oenothera biennis | Oenothera biennis L. var. pycnocarpa (Atkinson & Bartlett) Wieg. | OEBIP |
| Oenothera biennis | Oenothera muricata L. | OEMU2 |
| Oenothera biennis | Oenothera pycnocarpa Atkinson & Bartlett | OEPY2 |
| Oenothera brachycarpa | Lavauxia brachycarpa (Gray) Britt. | LABR3 |
| Oenothera brachycarpa | Megapterium brachycarpum (Gray) Levl. | MEBR5 |
| Oenothera brachycarpa | Oenothera brachycarpa Gray var. wrightii (Gray) Levl. | OEBRW |
| Oenothera brachycarpa | Oenothera caespitosa Nutt. ssp. australis Woot. & Standl. | OECAA5 |
| Oenothera brachycarpa | Oenothera caespitosa Nutt. var. australis (Woot. & Standl.) Munz | OECAA4 |
| Oenothera brachycarpa | Oenothera cespitosa Nutt. ssp. australis Woot. & Standl. [orthographic variant] | OECEA |
| Oenothera brachycarpa | Oenothera cespitosa Nutt. var. australis (Woot. & Standl.) Munz [orthographic variant] | OECEA2 |
| Oenothera caespitosa | Oenothera cespitosa Nutt. [orthographic variant] | OECE2 |
| Oenothera caespitosa ssp. caespitosa | Oenothera caespitosa Nutt. ssp. montana (Nutt.) Munz | OECAM8 |
| Oenothera caespitosa ssp. caespitosa | Oenothera caespitosa Nutt. ssp. purpurea (S. Wats.) Munz | OECAP4 |
| Oenothera caespitosa ssp. caespitosa | Oenothera caespitosa Nutt. var. montana (Nutt.) Dur. | OECAM6 |
| Oenothera caespitosa ssp. caespitosa | Oenothera caespitosa Nutt. var. purpurea (S. Wats.) Munz | OECAP2 |
| Oenothera caespitosa ssp. caespitosa | Oenothera cespitosa Nutt. ssp. cespitosa Nutt. [orthographic variant] | OECEC2 |
| Oenothera caespitosa ssp. caespitosa | Oenothera cespitosa Nutt. ssp. montana (Nutt.) Munz [orthographic variant] | OECEM |
| Oenothera caespitosa ssp. caespitosa | Oenothera cespitosa Nutt. ssp. purpurea (S. Wats.) Munz [orthographic variant] | OECEP2 |
| Oenothera caespitosa ssp. caespitosa | Oenothera cespitosa Nutt. var. montana (Nutt.) Dur. [orthographic variant] | OECEM5 |
| Oenothera caespitosa ssp. caespitosa | Oenothera cespitosa Nutt. var. purpurea (S. Wats.) Munz [orthographic variant] | OECEP3 |
| Oenothera caespitosa ssp. caespitosa | Pachylophis caespitosus (Nutt.) Raimann | PACA36 |
| Oenothera caespitosa ssp. caespitosa | Pachylophis cespitosus (Nutt.) Raimann [orthographic variant] | PACE2 |
| Oenothera caespitosa ssp. caespitosa | Pachylophis montanus (Nutt.) A. Nels. | PAMO9 |
| Oenothera caespitosa ssp. crinita | Oenothera caespitosa Nutt. ssp. jonesii (Munz) Munz | OECAJ3 |
| Oenothera caespitosa ssp. crinita | Oenothera caespitosa Nutt. var. crinita (Rydb.) Munz | OECAC4 |
| Oenothera caespitosa ssp. crinita | Oenothera caespitosa Nutt. var. jonesii Munz | OECAJ2 |
| Oenothera caespitosa ssp. crinita | Oenothera cespitosa Nutt. ssp. crinita (Rydb.) Munz [orthographic variant] | OECEC |
| Oenothera caespitosa ssp. crinita | Oenothera cespitosa Nutt. ssp. jonesii (Munz) Munz [orthographic variant] | OECEJ2 |
| Oenothera caespitosa ssp. crinita | Oenothera cespitosa Nutt. var. crinita (Rydb.) Munz [orthographic variant] | OECEC3 |
| Oenothera caespitosa ssp. crinita | Oenothera cespitosa Nutt. var. jonesii Munz [orthographic variant] | OECEJ |
| Oenothera caespitosa ssp. macroglottis | Oenothera caespitosa Nutt. ssp. eximia (Gray) Munz | OECAE4 |
| Oenothera caespitosa ssp. macroglottis | Oenothera caespitosa Nutt. var. eximia (Gray) Munz | OECAE3 |
| Oenothera caespitosa ssp. macroglottis | Oenothera caespitosa Nutt. var. longiflora (Heller) Munz | OECAL |
| Oenothera caespitosa ssp. macroglottis | Oenothera caespitosa Nutt. var. macroglottis (Rydb.) Cronq. | OECAM5 |
| Oenothera caespitosa ssp. macroglottis | Oenothera cespitosa Nutt. ssp. eximia (Gray) Munz [orthographic variant] | OECEE |
| Oenothera caespitosa ssp. macroglottis | Oenothera cespitosa Nutt. ssp. macroglottis (Rydb.) W.L. Wagner [orthographic variant] | OECEM3 |
| Oenothera caespitosa ssp. macroglottis | Oenothera cespitosa Nutt. var. eximia (Gray) Munz [orthographic variant] | OECEE2 |
| Oenothera caespitosa ssp. macroglottis | Oenothera cespitosa Nutt. var. longiflora (Heller) Munz [orthographic variant] | OECEL |
| Oenothera caespitosa ssp. macroglottis | Oenothera cespitosa Nutt. var. macroglottis (Rydb.) Cronq. [orthographic variant] | OECEM6 |
| Oenothera caespitosa ssp. marginata | Oenothera caespitosa Nutt. var. marginata (Nutt. ex Hook. & Arn.) Munz | OECAM7 |
| Oenothera caespitosa ssp. marginata | Oenothera cespitosa Nutt. ssp. marginata (Nutt. ex Hook. & Arn.) Munz [orthographic variant] | OECEM4 |
| Oenothera caespitosa ssp. marginata | Oenothera cespitosa Nutt. var. marginata (Nutt. ex Hook. & Arn.) Munz [orthographic variant] | OECEM2 |
| Oenothera caespitosa ssp. navajoensis | Oenothera caespitosa Nutt. var. navajoensis (W.L. Wagner, Stockhouse & Klein) Cronq. | OECAN2 |
| Oenothera caespitosa ssp. navajoensis | Oenothera cespitosa Nutt. ssp. navajoensis W.L. Wagner, Stockhouse & Klein [orthographic variant] | OECEN |
| Oenothera caespitosa ssp. navajoensis | Oenothera cespitosa Nutt. var. navajoensis (W.L. Wagner, Stockhouse & Klein) Cronq. [orthographic variant] | OECEN2 |
| Oenothera californica ssp. avita | Oenothera avita (W. Klein) W. Klein | OEAV |
| Oenothera californica ssp. californica | Oenothera californica (S. Wats.) S. Wats. var. glabrata Munz | OECAG |
| Oenothera californica ssp. eurekensis | Oenothera avita (W. Klein) W. Klein ssp. eurekensis (Munz & Roos) W. Klein | OEAVE |
| Oenothera californica ssp. eurekensis | Oenothera deltoides Torr. & Fr?m. ssp. eurekensis Munz & Roos | OEDEE |
| Oenothera canescens | Gaurella canescens (Torr. & Fr?m.) A. Nels. | GACA7 |
| Oenothera clelandii | Oenothera rhombipetala auct. non Nutt. ex Torr. & Gray [misapplied] | OERH2 |
| Oenothera cordata | Oenothera bifrons D. Don, non Lindl. | OEBI3 |
| Oenothera coronopifolia | Anogra coronopifolia (Torr. & Gray) Britt. | ANCO7 |
| Oenothera curtissii | Raimannia curtissii Rose | RACU2 |
| Oenothera deltoides ssp. ambigua | Oenothera deltoides Torr. & Fr?m. var. decumbens (S. Wats.) Munz | OEDED3 |
| Oenothera deltoides ssp. cognata | Oenothera deltoides Torr. & Fr?m. var. cognata (Jepson) Munz | OEDEC4 |
| Oenothera deltoides ssp. deltoides | Oenothera deltoides Torr. & Fr?m. var. cineracea (Jepson) Munz | OEDEC3 |
| Oenothera deltoides ssp. deltoides | Oenothera deltoides Torr. & Fr?m. var. typica Munz | OEDET |
| Oenothera deltoides ssp. deltoides | Oenothera kleinii W.L. Wagner & S. Mill. | OEKL |
| Oenothera deltoides ssp. howellii | Oenothera deltoides Torr. & Fr?m. var. howellii Munz | OEDEH2 |
| Oenothera deltoides ssp. piperi | Oenothera deltoides Torr. & Fr?m. var. piperi Munz | OEDEP3 |
| Oenothera drummondii | Raimannia drummondii (Hook.) Rose ex Sprague & Riley | RADR |
| Oenothera elata ssp. hirsutissima | Oenothera biennis L. var. hirsutissima Gray ex S. Wats. | OEBIH3 |
| Oenothera elata ssp. hirsutissima | Oenothera elata Kunth ssp. texensis W. Dietr. & W.L. Wagner | OEELT |
| Oenothera elata ssp. hirsutissima | Oenothera elata Kunth var. hirsutissima (Gray ex S. Wats.) Cronq. | OEELH3 |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray ssp. angustifolia (R.R. Gates) Munz | OEHOA3 |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray ssp. grisea (Bartlett) Munz | OEHOG |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray ssp. hewettii Cockerell | OEHOH5 |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray ssp. hirsutissima (Gray ex S. Wats.) Munz | OEHOH4 |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray ssp. ornata (A. Nels.) Munz | OEHOO |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray ssp. venusta (Bartlett) Munz | OEHOV |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray var. angustifolia R.R. Gates | OEHOA2 |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray var. hewettii (Cockerell) Cockerell | OEHOH2 |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray var. hirsutissima (Gray ex S. Wats.) Munz | OEHOH3 |
| Oenothera elata ssp. hirsutissima | Oenothera hookeri Torr. & Gray var. ornata (A. Nels.) Munz | OEHOO2 |
| Oenothera elata ssp. hirsutissima | Oenothera ornata (A. Nels.) Rydb. | OEOR2 |
| Oenothera elata ssp. hirsutissima | Oenothera simsiana auct. non Ser. [misapplied] | OESI2 |
| Oenothera elata ssp. hookeri | Oenothera biennis L. var. hookeri (Torr. & Gray) Boivin | OEBIH2 |
| Oenothera elata ssp. hookeri | Oenothera hookeri Torr. & Gray | OEHO |
| Oenothera elata ssp. hookeri | Oenothera hookeri Torr. & Gray ssp. montereyensis Munz | OEHOM |
| Oenothera flava ssp. flava | Lavauxia flava A. Nels. | LAFL2 |
| Oenothera flava ssp. taraxacoides | Lavauxia taraxacoides Woot. & Standl. | LATA2 |
| Oenothera flava ssp. taraxacoides | Oenothera taraxacoides (Woot. & Standl.) Munz | OETA2 |
| Oenothera fruticosa ssp. fruticosa | Kneiffia allenii (Britt.) Small | KNAL |
| Oenothera fruticosa ssp. fruticosa | Kneiffia arenicola Small | KNAR2 |
| Oenothera fruticosa ssp. fruticosa | Kneiffia brevistipata (Pennell) Munz | KNBR |
| Oenothera fruticosa ssp. fruticosa | Kneiffia fruticosa (L.) Raimann | KNFR |
| Oenothera fruticosa ssp. fruticosa | Kneiffia linearis (Michx.) Spach | KNLI |
| Oenothera fruticosa ssp. fruticosa | Kneiffia longipedicellata Small | KNLO |
| Oenothera fruticosa ssp. fruticosa | Kneiffia riparia (Nutt.) Small | KNRI |
| Oenothera fruticosa ssp. fruticosa | Kneiffia semiglandulosa Pennell | KNSE |
| Oenothera fruticosa ssp. fruticosa | Kneiffia subglobosa Small | KNSU |
| Oenothera fruticosa ssp. fruticosa | Oenothera arenicola (Small) Coker | OEAR3 |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. eamesii (B.L. Robins.) Blake | OEFRE |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. goodmanii Munz | OEFRG2 |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. humifusa Allen | OEFRH |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. linearis (Michx.) S. Wats. | OEFRL |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. microcarpa Fern. | OEFRM |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. subglobosa (Small) Munz | OEFRS |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. unguiculata Fern. | OEFRU |
| Oenothera fruticosa ssp. fruticosa | Oenothera fruticosa L. var. vera Hook. | OEFRV |
| Oenothera fruticosa ssp. fruticosa | Oenothera longipedicellata (Small) Robinson | OELO2 |
| Oenothera fruticosa ssp. fruticosa | Oenothera tetragona Roth var. brevistipata (Pennell) Munz | OETEB |
| Oenothera fruticosa ssp. fruticosa | Oenothera tetragona Roth var. longistipata (Pennell) Munz | OETEL |
| Oenothera fruticosa ssp. fruticosa | Oenothera tetragona Roth var. riparia (Nutt.) Munz | OETER |
| Oenothera fruticosa ssp. fruticosa | Oenothera tetragona Roth var. sharpii Munz | OETES |
| Oenothera fruticosa ssp. fruticosa | Oenothera tetragona Roth var. velutina (Pennell) Munz | OETEV |
| Oenothera fruticosa ssp. glauca | Kneiffia glauca (Michx.) Spach | KNGL |
| Oenothera fruticosa ssp. glauca | Kneiffia hybrida (Michx.) Small | KNHY |
| Oenothera fruticosa ssp. glauca | Kneiffia latifolia Rydb. | KNLA |
| Oenothera fruticosa ssp. glauca | Kneiffia tetragona (Roth) Pennell | KNTE |
| Oenothera fruticosa ssp. glauca | Oenothera riparia Nutt. | OERI |
| Oenothera fruticosa ssp. glauca | Oenothera tetragona Roth | OETE4 |
| Oenothera fruticosa ssp. glauca | Oenothera tetragona Roth ssp. glauca (Michx.) Munz | OETEG |
| Oenothera fruticosa ssp. glauca | Oenothera tetragona Roth var. fraseri (Pursh) Munz | OETEF |
| Oenothera fruticosa ssp. glauca | Oenothera tetragona Roth var. hybrida (Michx.) Fern. | OETEH |
| Oenothera fruticosa ssp. glauca | Oenothera tetragona Roth var. latifolia (Rydb.) Fern. | OETEL2 |
| Oenothera glazioviana | Oenothera erythrosepala Borb | OEER2 |
| Oenothera glazioviana | Oenothera lamarckiana auct. | OELA6 |
| Oenothera grandis | Oenothera laciniata Hill var. grandiflora (S. Wats.) B.L. Robins. | OELAG2 |
| Oenothera grandis | Raimannia grandis (Britt.) Rose | RAGR2 |
| Oenothera howardii | Lavauxia howardii A. Nels. | LAHO4 |
| Oenothera humifusa | Raimannia humifusa (Nutt.) Rose | RAHU |
| Oenothera humifusa | Raimannia mollissima auct. non (L.) Sprague & Riley [misapplied] | RAMO2 |
| Oenothera laciniata | Raimannia laciniata (Hill) Rose | RALA6 |
| Oenothera latifolia | Oenothera pallida Lindl. ssp. latifolia (Rydb.) Munz | OEPAL |
| Oenothera linifolia | Kneiffia linifolia (Nutt.) Spach | KNLI2 |
| Oenothera linifolia | Oenothera linifolia Nutt. var. glandulosa Munz | OELIG |
| Oenothera linifolia | Peniophyllum linifolium (Nutt.) Pennell | PELI11 |
| Oenothera longissima | Oenothera longissima Rydb. ssp. clutei (A. Nels.) Munz | OELOC |
| Oenothera longissima | Oenothera longissima Rydb. ssp. typica Munz | OELOT |
| Oenothera longissima | Oenothera longissima Rydb. var. clutei (A. Nels.) Munz | OELOC2 |
| Oenothera macrocarpa ssp. fremontii | Megapterium fremontii (S. Wats.) Britt. | MEFR3 |
| Oenothera macrocarpa ssp. fremontii | Oenothera fremontii S. Wats. | OEFR2 |
| Oenothera macrocarpa ssp. incana | Oenothera macrocarpa Nutt. var. incana (Gray) Reveal | OEMAI |
| Oenothera macrocarpa ssp. incana | Oenothera missouriensis Sims var. incana Gray | OEMII2 |
| Oenothera macrocarpa ssp. macrocarpa | Megapterium missouriense (Sims) Spach | MEMI6 |
| Oenothera macrocarpa ssp. macrocarpa | Oenothera missouriensis Sims | OEMI5 |
| Oenothera macrocarpa ssp. oklahomensis | Megapterium oklahomense J.B.S. Norton | MEOK |
| Oenothera macrocarpa ssp. oklahomensis | Oenothera macrocarpa Nutt. var. oklahomensis (J.B.S. Norton) Reveal | OEMAO |
| Oenothera macrocarpa ssp. oklahomensis | Oenothera missouriensis Sims var. oklahomensis (J.B.S. Norton) Munz | OEMIO2 |
| Oenothera nutans | Oenothera austromontana (Munz) Raven, W. Dietr. & Stubbe | OEAU |
| Oenothera nutans | Oenothera biennis L. ssp. austromontana Munz | OEBIA |
| Oenothera nutans | Oenothera biennis L. var. austromontana (Munz) Cronq. | OEBIA2 |
| Oenothera nutans | Oenothera biennis L. var. nutans (Atkinson & Bartlett) Wieg. | OEBIN |
| Oenothera nuttallii | Anogra nuttalliana Spach | ANNU6 |
| Oenothera oakesiana | Oenothera angustissima R.R. Gates | OEAN2 |
| Oenothera oakesiana | Oenothera biennis L. var. oakesiana Gray | OEBIO |
| Oenothera oakesiana | Oenothera cruciata Nutt. ex G. Don var. stenopetala (Bickn.) Fern. | OECRS |
| Oenothera oakesiana | Oenothera parviflora L. ssp. angustissima (R.R. Gates) Munz | OEPAA |
| Oenothera oakesiana | Oenothera parviflora L. var. angustissima (R.R. Gates) Wieg. | OEPAA2 |
| Oenothera oakesiana | Oenothera parviflora L. var. oakesiana (Gray) Fern. | OEPAO |
| Oenothera organensis | Oenothera macrosiphon Woot. & Standl. | OEMA3 |
| Oenothera pallida ssp. gypsophila | Oenothera runcinata (Engelm.) Munz var. gypsophila (Eastw.) Munz | OERUG |
| Oenothera pallida ssp. pallida | Oenothera pallida Lindl. var. idahoensis Munz | OEPAI |
| Oenothera pallida ssp. pallida | Oenothera pallida Lindl. var. typica Munz | OEPAT2 |
| Oenothera pallida ssp. runcinata | Oenothera pallida Lindl. var. runcinata (Engelm.) Cronq. | OEPAR2 |
| Oenothera pallida ssp. runcinata | Oenothera runcinata (Engelm.) Munz | OERU3 |
| Oenothera pallida ssp. runcinata | Oenothera runcinata (Engelm.) Munz var. brevifolia (Engelm.) Munz | OERUB |
| Oenothera pallida ssp. runcinata | Oenothera runcinata (Engelm.) Munz var. leucotricha (Woot. & Standl.) Munz | OERUL |
| Oenothera pallida ssp. runcinata | Oenothera runcinata (Engelm.) Munz var. typica Munz | OERUT |
| Oenothera pallida ssp. trichocalyx | Oenothera pallida Lindl. var. trichocalyx (Nutt.) Dorn | OEPAT3 |
| Oenothera pallida ssp. trichocalyx | Oenothera trichocalyx Nutt. | OETR4 |
| Oenothera parviflora | Camissonia strigulosa auct. non (Fisch. & C.A. Mey.) Raven [misapplied] | CAST58 |
| Oenothera parviflora | Oenothera cruciata Nutt. ex G. Don | OECR3 |
| Oenothera parviflora | Oenothera cruciata Nutt. ex G. Don var. sabulonensis Fern. | OECRS2 |
| Oenothera parviflora | Oenothera cymatilis Bartlett | OECY |
| Oenothera parviflora | Oenothera rubricapitata R.R. Gates | OERU2 |
| Oenothera perennis | Kneiffia perennis (L.) Pennell | KNPE |
| Oenothera perennis | Kneiffia pumila (L.) Spach | KNPU |
| Oenothera perennis | Oenothera perennis L. var. rectipilis (Blake) Blake | OEPER |
| Oenothera perennis | Oenothera perennis L. var. typica Munz | OEPET |
| Oenothera pilosella ssp. pilosella | Kneiffia pratensis Small | KNPR |
| Oenothera pilosella ssp. pilosella | Kneiffia sumstinei Jennings | KNSU2 |
| Oenothera pilosella ssp. sessilis | Oenothera sessilis (Pennell) Munz | OESE2 |
| Oenothera primiveris ssp. bufonis | Oenothera primiveris Gray var. bufonis (M.E. Jones) Cronq. | OEPRB2 |
| Oenothera primiveris ssp. primiveris | Oenothera primiveris Gray ssp. caulescens (Munz) Munz | OEPRC |
| Oenothera primiveris ssp. primiveris | Oenothera primiveris Gray var. caulescens Munz | OEPRC2 |
| Oenothera psammophila | Oenothera caespitosa Nutt. var. psammophila (A. Nels. & J.F. Macbr.) Munz | OECAP3 |
| Oenothera psammophila | Oenothera cespitosa Nutt. var. psammophila (A. Nels. & J.F. Macbr.) Munz [orthographic variant] | OECEP |
| Oenothera pubescens | Oenothera amplexicaulis (Woot. & Standl.) Tidestrom | OEAM |
| Oenothera pubescens | Oenothera laciniata Hill ssp. pubescens (Willd. ex Spreng.) Munz | OELAP |
| Oenothera pubescens | Oenothera laciniata Hill var. pubescens (Willd. ex Spreng.) Munz | OELAP2 |
| Oenothera rhombipetala | Oenothera heterophylla Spach var. rhombipetala (Nutt. ex Torr. & Gray) Fosberg | OEHER |
| Oenothera rhombipetala | Raimannia rhombipetala (Nutt. ex Torr. & Gray) Rose | RARH3 |
| Oenothera speciosa | Hartmannia speciosa (Nutt.) Small | HASP4 |
| Oenothera speciosa | Oenothera delessertiana Steud. | OEDE4 |
| Oenothera speciosa | Oenothera speciosa Nutt. var. childsii (Bailey) Munz | OESPC |
| Oenothera stricta | Oenothera stricta Link ssp. stricta Link [superfluous autonym] | OESTS |
| Oenothera triloba | Lavauxia triloba (Nutt.) Spach | LATR6 |
| Oenothera triloba | Lavauxia watsonii (Britt.) Small | LAWA6 |
| Oenothera triloba | Oenothera hamata (Woot. & Standl.) Tidestrom | OEHA5 |
| Oenothera villosa ssp. strigosa | Oenothera biennis L. var. strigosa (Rydb.) Piper | OEBIS |
| Oenothera villosa ssp. strigosa | Oenothera cheradophila Bartlett | OECH3 |
| Oenothera villosa ssp. strigosa | Oenothera depressa Greene ssp. strigosa (Rydb.) Taylor & MacBryde | OEDES |
| Oenothera villosa ssp. strigosa | Oenothera procera Woot. & Standl. | OEPR3 |
| Oenothera villosa ssp. strigosa | Oenothera rydbergii House | OERY |
| Oenothera villosa ssp. strigosa | Oenothera strigosa (Rydb.) Mackenzie & Bush | OEST3 |
| Oenothera villosa ssp. strigosa | Oenothera strigosa (Rydb.) Mackenzie & Bush ssp. cheradophila (Bartlett) Munz | OESTC |
| Oenothera villosa ssp. strigosa | Oenothera villosa Thunb. ssp. cheradophila (Bartlett) W. Dietr. & Raven | OEVIC |
| Oenothera villosa ssp. strigosa | Oenothera villosa Thunb. var. strigosa (Rydb.) Dorn | OEVIS2 |
| Oenothera villosa ssp. villosa | Oenothera albinervis R.R. Gates | OEAL3 |
| Oenothera villosa ssp. villosa | Oenothera biennis L. var. canescens Torr. & Gray | OEBIC2 |
| Oenothera villosa ssp. villosa | Oenothera canovirens Steele | OECA6 |
| Oenothera villosa ssp. villosa | Oenothera depressa Greene | OEDE7 |
| Oenothera villosa ssp. villosa | Oenothera strigosa (Rydb.) Mackenzie & Bush ssp. canovirens (Steele) Munz | OESTC2 |
| Oenothera villosa ssp. villosa | Oenothera villosa Thunb. ssp. canovirens (Steele) W. Dietr. & Raven | OEVIC2 |
| Oenothera wolfii | Oenothera hookeri Torr. & Gray ssp. wolfii Munz | OEHOW |
| Oklahoma evening-primrose | Oenothera macrocarpa Nutt. ssp. oklahomensis (J.B.S. Norton) Wagner | OEMAO2 |
| Olympic Mountain willowherb | Epilobium mirabile Trel. ex Piper | EPMI3 |
| Oregon willowherb | Epilobium oregonense Hausskn. | EPOR2 |
| Organ Mountain evening-primrose | Oenothera organensis Munz | OEOR |
| Oriental evening-primrose | Oenothera heterophylla Spach ssp. orientalis W. Dietr., Raven & W.L. Wagner | OEHEO |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven | CASC18 |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven ssp. brachycarpa (Raven) Raven | CASCB2 |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven ssp. macrocarpa (Raven) Raven | CASCM |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven ssp. scapoidea | CASCS3 |
| pale evening-primrose | Oenothera pallida Lindl. | OEPA |
| pale evening-primrose | Oenothera pallida Lindl. ssp. pallida | OEPAP |
| pale evening-primrose | Oenothera pallida Lindl. ssp. runcinata (Engelm.) Munz & W. Klein | OEPAR |
| pale evening-primrose | Oenothera pallida Lindl. ssp. trichocalyx (Nutt.) Munz & W. Klein | OEPAT |
| paleyellow suncup | Camissonia pallida (Abrams) Raven | CAPA36 |
| paleyellow suncup | Camissonia pallida (Abrams) Raven ssp. pallida | CAPAP5 |
| pallid suncup | Camissonia brevipes (Gray) Raven ssp. pallidula (Munz) Raven | CABRP |
| Palmer evening-primrose | Camissonia palmeri (S. Wats.) Raven | CAPA37 |
| Parks's beeblossom | Gaura villosa Torr. ssp. parksii (Munz) Raven & Gregory | GAVIP |
| Peebles's browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. peeblesii (Munz) Raven | CACLP2 |
| Peirson's browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. peirsonii (Munz) Raven | CACLP3 |
| Peruvian primrose-willow | Ludwigia peruviana (L.) Hara | LUPE6 |
| piedmont primrose-willow | Ludwigia arcuata Walt. | LUAR8 |
| pimpernel willowherb | Epilobium anagallidifolium Lam. | EPAN4 |
| pinegrove groundsmoke | Gayophytum oligospermum Lewis & Szweykowski | GAOL |
| pinkfairies | Clarkia pulchella Pursh | CLPU |
| pinkladies | Oenothera speciosa Nutt. | OESP2 |
| pinyon groundsmoke | Gayophytum ramosissimum Torr. & Gray | GARA2 |
| Piper's evening-primrose | Oenothera deltoides Torr. & Fr?m. ssp. piperi (Munz) W. Klein | OEDEP |
| Pismo clarki | Clarkia speciosa H.F. & M.E. Lewis ssp. immaculata H.F. & M.E. Lewis | CLSPI |
| plains beeblossom | Gaura brachycarpa Small | GABR2 |
| plains evening-primrose | Camissonia contorta (Dougl. ex Lehm.) Kearney | CACO34 |
| prairie beeblossom | Gaura triangulata Buckl. | GATR5 |
| Presidio clarkia | Clarkia franciscana Lewis & Raven | CLFR3 |
| primrose-willow | Ludwigia L. | LUDWI |
| prostrate clarkia | Clarkia prostrata H.F. & M.E. Lewis | CLPR |
| purpleleaf willowherb | Epilobium coloratum Biehler | EPCO |
| Raiche's clarkia | Clarkia concinna (Fisch. & C.A. Mey.) Greene ssp. raichei G. Allen, V. Ford & L. Gottlieb | CLCOR |
| Ramona clarkia | Clarkia similis Lewis & Ernst | CLSI |
| Raven's primrose-willow | Ludwigia ravenii Peng | LURA |
| red ribbons | Clarkia concinna (Fisch. & C.A. Mey.) Greene | CLCO |
| red ribbons | Clarkia concinna (Fisch. & C.A. Mey.) Greene ssp. automixa R.N. Bowman | CLCOA |
| red ribbons | Clarkia concinna (Fisch. & C.A. Mey.) Greene ssp. concinna | CLCOC |
| redclay suncup | Camissonia parryi (S. Wats.) Raven | CAPA38 |
| redsepal evening-primrose | Oenothera glazioviana Micheli | OEGL |
| redspot clarkia | Clarkia speciosa H.F. & M.E. Lewis | CLSP |
| redspot clarkia | Clarkia speciosa H.F. & M.E. Lewis ssp. nitens (H.F. & M.E. Lewis) Lewis & Raven | CLSPN |
| redspot clarkia | Clarkia speciosa H.F. & M.E. Lewis ssp. polyantha H.F. & M.E. Lewis | CLSPP |
| redspot clarkia | Clarkia speciosa H.F. & M.E. Lewis ssp. speciosa | CLSPS |
| Rio Grande beeblossom | Gaura boquillensis Raven & Gregory | GABO3 |
| robust suncup | Camissonia robusta Raven | CARO13 |
| rockfringe | Epilobium obcordatum Gray | EPOB |
| Rocky Mountain willowherb | Epilobium saximontanum Hausskn. | EPSA |
| rose evening-primrose | Oenothera rosea L'H?r. ex Ait. | OERO |
| royal evening-primrose | Oenothera falfurriae W. Dietr. & W.L. Wagner | OEFA |
| ruby chalice clarkia | Clarkia rubicunda (Lindl.) H.F. & M.E. Lewis | CLRU |
| San Benito suncup | Camissonia benitensis Raven | CABE7 |
| San Bernardino suncup | Camissonia confusa Raven | CACO33 |
| sandysoil suncup | Camissonia strigulosa (Fisch. & C.A. Mey.) Raven | CAST20 |
| Santa Cruz Island suncup | Camissonia hirtella (Greene) Raven | CAHI13 |
| Santa Lucia suncup | Camissonia luciae Raven | CALU13 |
| savannah primrose-willow | Ludwigia virgata Michx. | LUVI2 |
| scarlet beeblossom | Gaura coccinea Nutt. ex Pursh | GACO5 |
| seabeach evening-primrose | Oenothera humifusa Nutt. | OEHU |
| seaside primrose-willow | Ludwigia maritima Harper | LUMA4 |
| seedbox | Ludwigia alternifolia L. | LUAL2 |
| seedbox | Ludwigia hyssopifolia (G. Don) Exell apud A.R. Fernandes | LUHY6 |
| selfing willowherb | Epilobium cleistogamum (Curran) Hoch & Raven | EPCL3 |
| shale barren evening-primrose | Oenothera argillicola Mackenzie | OEAR |
| Shasta clarkia | Clarkia borealis E. Small ssp. arida E. Small | CLBOA |
| Shockley's evening-primrose | Camissonia heterochroma (S. Wats.) Raven | CAHE12 |
| shortfruit evening-primrose | Oenothera brachycarpa Gray | OEBR |
| showy evening-primrose | Oenothera grandis (Britt.) Smyth | OEGR2 |
| shredding suncup | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. condensata (Munz) Raven | CABOC |
| shredding suncup | Camissonia boothii (Dougl. ex Lehm.) Raven ssp. decorticans (Hook. & Arn.) Raven | CABOD |
| shrubby fuchsia | Fuchsia paniculata Lindl. | FUPA2 |
| shrubby primrose-willow | Ludwigia suffruticosa Walt. | LUSU11 |
| shrubby willowherb | Epilobium suffruticosum Nutt. | EPSU |
| Sierra clarkia | Clarkia virgata Greene | CLVI2 |
| Sierra suncup | Camissonia sierrae Raven | CASI9 |
| Sierra suncup | Camissonia sierrae Raven ssp. sierrae | CASIS2 |
| Sierra Valley evening-primrose | Camissonia tanacetifolia (Torr. & Gray) Raven ssp. quadriperforata Raven | CATAQ |
| Simpson's primrose-willow | Ludwigia simpsonii Chapman | LUSI3 |
| Siskiyou willowherb | Epilobium siskiyouense (Munz) Hoch & Raven | EPSI2 |
| slender clarkia | Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. | CLGR |
| slender clarkia | Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. ssp. gracilis | CLGRG2 |
| slenderfruit willowherb | Epilobium leptocarpum Hausskn. | EPLE |
| slenderstalk beeblossom | Gaura filipes Spach | GAFI2 |
| small enchanter's nightshade | Circaea alpina L. | CIAL |
| small enchanter's nightshade | Circaea alpina L. ssp. alpina | CIALA |
| small enchanter's nightshade | Circaea alpina L. ssp. pacifica (Aschers. & Magnus) Raven | CIALP2 |
| small evening-primrose | Camissonia minor (A. Nels.) Raven | CAMI23 |
| Small's southern clarkia | Clarkia australis E. Small | CLAU2 |
| smallflower hairy willowherb | Epilobium parviflorum Schreb. | EPPA5 |
| smallfruit primrose-willow | Ludwigia microcarpa Michx. | LUMI4 |
| smooth spike-primrose | Epilobium pygmaeum (Speg.) Hoch & Raven | EPPY4 |
| Snow Mountain willowherb | Epilobium nivium Brandeg. | EPNI |
| Sonoma clarkia | Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. ssp. sonomensis (C.L. Hitchc.) H.F. & M.E. Lewis | CLGRS |
| South American evening-primrose | Oenothera pubescens Willd. ex Spreng. | OEPU |
| southeastern primrose-willow | Ludwigia linifolia Poir. | LULI3 |
| southern beeblossom | Gaura angustifolia Michx. | GAAN4 |
| southern suncup | Camissonia bistorta (Nutt. ex Torr. & Gray) Raven | CABI12 |
| Spach's evening-primrose | Oenothera spachiana Torr. & Gray | OESP |
| speckled clarkia | Clarkia cylindrica (Jepson) H.F. & M.E. Lewis | CLCY |
| speckled clarkia | Clarkia cylindrica (Jepson) H.F. & M.E. Lewis ssp. clavicarpa W.S. Davis | CLCYC |
| speckled clarkia | Clarkia cylindrica (Jepson) H.F. & M.E. Lewis ssp. cylindrica | CLCYC2 |
| spindleroot | Ludwigia hirtella Raf. | LUHI |
| spoon primrose-willow | Ludwigia spathulata Torr. & Gray | LUSP5 |
| spotted evening-primrose | Oenothera canescens Torr. & Fr?m. | OECA3 |
| spreading groundsmoke | Gayophytum diffusum Torr. & Gray | GADI2 |
| spreading groundsmoke | Gayophytum diffusum Torr. & Gray ssp. diffusum | GADID |
| spreading groundsmoke | Gayophytum diffusum Torr. & Gray ssp. parviflorum Lewis & Szweykowski | GADIP |
| Springville clarkia | Clarkia springvillensis Vasek | CLSP6 |
| St. Anthony Dunes evening-primrose | Oenothera psammophila (A. Nels. & J.F. Macbr.) W.L. Wagner, Stockhouse & Klein | OEPS2 |
| stemless evening-primrose | Oenothera triloba Nutt. | OETR2 |
| stenosiphon | Stenosiphon Spach | STENO2 |
| Stenosiphon linifolius | Stenosiphon virgatus Spach | STVI11 |
| stiff willowherb | Epilobium rigidum Hausskn. | EPRI |
| suncup | Camissonia Link | CAMIS |
| sundrops | Calylophus Spach | CALYL |
| tall annual willowherb | Epilobium brachycarpum K. Presl | EPBR3 |
| talus willowherb | Epilobium clavatum Trel. | EPCL |
| tansyleaf evening-primrose | Camissonia tanacetifolia (Torr. & Gray) Raven | CATA2 |
| tansyleaf evening-primrose | Camissonia tanacetifolia (Torr. & Gray) Raven ssp. tanacetifolia | CATAT |
| Temblor Range clarkia | Clarkia tembloriensis Vasek | CLTE5 |
| Temblor Range clarkia | Clarkia tembloriensis Vasek ssp. tembloriensis | CLTET |
| Texas beeblossom | Gaura calcicola Raven & Gregory | GACA5 |
| Texas evening-primrose | Oenothera texensis Raven & Parnell | OETE3 |
| Texas sundrops | Calylophus tubicula (Gray) Raven | CATU6 |
| threadleaf evening-primrose | Oenothera linifolia Nutt. | OELI |
| Torrey's willowherb | Epilobium torreyi (S. Wats.) Hoch & Raven | EPTO4 |
| Toumey's sundrops | Calylophus toumeyi (Small) Towner | CATO12 |
| Tracy's clarkia | Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. ssp. tracyi (Jepson) Abdel-Hamee & R. Snow | CLGRT |
| TransPecos beeblossom | Gaura macrocarpa Rothrock | GAMA5 |
| trumpet evening-primrose | Oenothera jamesii Torr. & Gray | OEJA |
| tufted evening-primrose | Oenothera caespitosa Nutt. | OECA10 |
| tufted evening-primrose | Oenothera caespitosa Nutt. ssp. caespitosa | OECAC2 |
| tufted evening-primrose | Oenothera caespitosa Nutt. ssp. crinita (Rydb.) Munz | OECAC3 |
| tufted evening-primrose | Oenothera caespitosa Nutt. ssp. macroglottis (Rydb.) W.L. Wagner | OECAM3 |
| tufted evening-primrose | Oenothera caespitosa Nutt. ssp. marginata (Nutt. ex Hook. & Arn.) Munz | OECAM4 |
| twolobe clarkia | Clarkia biloba (Dur.) A. Nels. & J.F. Macbr. | CLBI |
| twolobe clarkia | Clarkia biloba (Dur.) A. Nels. & J.F. Macbr. ssp. biloba | CLBIB2 |
| Utah suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven ssp. utahensis (Raven) Raven | CASCU |
| variableleaf evening-primrose | Oenothera heterophylla Spach | OEHE3 |
| variableleaf evening-primrose | Oenothera heterophylla Spach ssp. heterophylla | OEHEH |
| Vasek's clarkia | Clarkia tembloriensis Vasek ssp. calientensis (Vasek) Holsinger | CLTEC |
| velvetweed | Gaura mollis James | GAMO5 |
| Vine Hill clarkia | Clarkia imbricata H.F. & M.E. Lewis | CLIM |
| Volcan's fuchsia | Fuchsia vulcanica Andre. | FUVU |
| Walker's suncup | Camissonia walkeri (A. Nels.) Raven | CAWA3 |
| Walker's suncup | Camissonia walkeri (A. Nels.) Raven ssp. tortilis (Jepson) Raven | CAWAT |
| Walker's suncup | Camissonia walkeri (A. Nels.) Raven ssp. walkeri | CAWAW2 |
| Waltham Creek clarkia | Clarkia modesta Jepson | CLMO |
| wavyleaf beeblossom | Gaura sinuata Nutt. ex Ser. | GASI |
| whitepole evening-primrose | Oenothera pallida Lindl. ssp. gypsophila (Eastw.) Munz & W. Klein | OEPAG |
| whitest evening-primrose | Oenothera albicaulis Pursh | OEAL |
| whitestem clarkia | Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. ssp. albicaulis (Jepson) H.F. & M.E. Lewis | CLGRA |
| Whitney's clarkia | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. ssp. whitneyi (Gray) H.F. & M.E. Lewis | CLAMW |
| willowherb | Epilobium L. | EPILO |
| winecup clarkia | Clarkia purpurea (W. Curtis) A. Nels. & J.F. Macbr. | CLPU2 |
| winecup clarkia | Clarkia purpurea (W. Curtis) A. Nels. & J.F. Macbr. ssp. purpurea | CLPUP |
| winecup clarkia | Clarkia purpurea (W. Curtis) A. Nels. & J.F. Macbr. ssp. quadrivulnera (Dougl. ex Lindl.) H.F. & M.E. Lewis | CLPUQ |
| winecup clarkia | Clarkia purpurea (W. Curtis) A. Nels. & J.F. Macbr. ssp. viminea (Dougl. ex Hook.) H.F. & M.E. Lewis | CLPUV |
| winged primrose-willow | Ludwigia alata Ell. | LUAL |
| wingfruit suncup | Camissonia pterosperma (S. Wats.) Raven | CAPT |
| wingleaf primrose-willow | Ludwigia decurrens Walt. | LUDE4 |
| Wolf's evening-primrose | Oenothera wolfii (Munz) Raven, W. Dietr. & Stubbe | OEWO |
| woodyfruit evening-primrose | Oenothera xylocarpa Coville | OEXY |
| woolly beeblossom | Gaura villosa Torr. | GAVI2 |
| woolly beeblossom | Gaura villosa Torr. ssp. villosa | GAVIV |
| yellow cups | Camissonia brevipes (Gray) Raven | CABR23 |
| yellow evening-primrose | Oenothera flava (A. Nels.) Garrett | OEFL |
| yellow evening-primrose | Oenothera flava (A. Nels.) Garrett ssp. flava | OEFLF |
| yellow evening-primrose | Oenothera flava (A. Nels.) Garrett ssp. taraxacoides (Woot. & Standl.) W.L. Wagner | OEFLT |
| yellow sundrops | Calylophus serrulatus (Nutt.) Raven | CASE12 |
| yellow willowherb | Epilobium luteum Pursh | EPLU |
| yerba de jicotea | Ludwigia erecta (L.) Hara | LUER |
| Yuba Pass willowherb | Epilobium howellii Hoch | EPHO3 |
| Yuma browneyes | Camissonia claviformis (Torr. & Fr?m.) Raven ssp. yumae (Raven) Raven | CACLY |
| zigzag groundsmoke | Gayophytum heterozygum Lewis & Szweykowski | GAHE3 |