| Common Name | Scientific Name | Code |
| n/a | Acanthus polystachyus Delile | ACPO10 |
| n/a | Acanthus polystachyus Delile var. pseudopubescens Cufod. | ACPOP |
| n/a | Anisacanthus junceus (Torr.) Hemsl. [excluded] | ANJU5 |
| n/a | Crossandra infundibuliformis (L.) Nees | CRIN29 |
| n/a | Crossandra nilotica Oliv. | CRNI7 |
| n/a | Dyschoriste linearis (Torr. & Gray) Kuntze var. sanpatriciensis Henrickson | DYLIS |
| n/a | Dyschoriste schiedeana (Nees) Kuntze var. cinerascens Henrickson & Hilsenb. | DYSCC |
| n/a | Holographis Nees | HOLOG3 |
| n/a | Holographis virgata (Harvey ex Benth. & Hook. f.) Daniel [excluded] | HOVI6 |
| n/a | Justicia candicans (N?es) L. Benson var. subglabra (S. Wats.) L. Benson [excluded] | JUCAS3 |
| n/a | Pseuderanthemum carruthersii (Seem.) Guill. var. atropurpureum Fosberg | PSCAA3 |
| n/a | Pseuderanthemum carruthersii (Seem.) Guill. var. carruthersii Fosberg | PSCAC3 |
| n/a | Ruellia dipteracanthus Hemsl. | RUDI13 |
| n/a | Ruellia patula Jacq. | RUPA26 |
| n/a | Stenandrium dulce (Cav.) Nees var. floridanum Gray | STDUF |
| n/a | Strobilanthes anisophylla (G. Lodd.) T. Anderson | STAN12 |
| n/a | Strobilanthes Blume | STROB |
| acanthus | Acanthus ebracteatus Vahl | ACEB3 |
| acanthus | Acanthus L. | ACANT7 |
| Acanthus polystachyus var. pseudopubescens | Acanthus pubescens Engl. | ACPU4 |
| American water-willow | Justicia americana (L.) Vahl | JUAM |
| Andrographis echioides | Justicia echioides L. | JUEC2 |
| Anisacanthus junceus | Drejera juncea Torr. [excluded] | DRJU3 |
| Anisacanthus linearis | Anisacanthus insignis Gray var. linearis Hagen | ANINL |
| Anisacanthus puberulus | Anisacanthus insignis Gray | ANIN3 |
| Anisacanthus puberulus | Drejera puberula Torr. | DRPU4 |
| Anisacanthus quadrifidus var. wrightii | Anisacanthus wrightii (Torr.) Gray | ANWR2 |
| Anisacanthus quadrifidus var. wrightii | Drejera wrightii Torr. | DRWR |
| Anisacanthus thurberi | Drejera thurberi Torr. | DRTH3 |
| Arizona foldwing | Dicliptera resupinata (Vahl) Juss. | DIRE4 |
| Arizona water-willow | Justicia candicans (Nees) L. Benson | JUCA9 |
| Arizona wrightwort | Carlowrightia arizonica Gray | CAAR7 |
| asystasia | Asystasia Blume | ASYST |
| Asystasia gangetica | Asystasia coromandeliana Nees | ASCO34 |
| Asystasia gangetica | Justicia gangetica L. | JUGA |
| barleriola | Barleriola Oerst. | BARLE2 |
| Barleriola solanifolia | Barleria solanifolia L. | BASO2 |
| bear's breech | Acanthus mollis L. | ACMO8 |
| bedding conehead | Strobilanthes anisophylla (G. Lodd.) T. Anderson | STANI |
| beloperone | Justicia californica (Benth.) D. Gibson | JUCA8 |
| Bengal trumpet | Thunbergia grandiflora Roxb. | THGR3 |
| blackeyed Susan vine | Thunbergia alata Bojer ex Sims | THAL3 |
| blechum | Blechum P. Br. | BLECH2 |
| Blechum pyramidatum | Blechum blechum (L.) Millsp. | BLBL |
| Blechum pyramidatum | Blechum brownei Juss. | BLBR |
| Blechum pyramidatum | Ruellia blechum L. | RUBL3 |
| blue pussyleaf | Nelsonia canescens (Lam.) Spreng. | NECA4 |
| blue-sage | Eranthemum pulchellum Andr. | ERPU18 |
| bractspike | Yeatesia Small | YEATE |
| branched foldwing | Dicliptera brachiata (Pursh) Spreng. | DIBR2 |
| Brazilian red-cloak | Megaskepasma erythrochlamys Lindau | MEER6 |
| Brazilian red-cloak | Megaskepasma Lindau | MEGAS2 |
| Brazilian wild petunia | Ruellia devosiana hort. Makoy ex E. Murr. | RUDE13 |
| Brazilian-plume | Justicia carnea Lindl. | JUCA17 |
| Britton's wild petunia | Ruellia caerulea Morong | RUCA19 |
| Browne's blechum | Blechum pyramidatum (Lam.) Urban | BLPY |
| bush clockvine | Thunbergia erecta (Benth.) T. Anders. | THER |
| cardinal's-guard | Pachystachys spicata (Ruiz & Pav?n) Wasshausen | PASP17 |
| caricature-plant | Graptophyllum pictum (L.) Griffith | GRPI4 |
| Carlowrightia linearifolia | Schaueria linearifolia Torr. | SCLI9 |
| Carlowrightia parviflora | Dianthera parviflora (Buckl.) Gray | DIPA11 |
| Carlowrightia parviflora | Drejera parviflora Buckl. | DRPA13 |
| Carlowrightia torreyana | Carlowrightia pubens Gray | CAPU21 |
| Carlowrightia torreyana | Croftia parvifolia (Torr.) Small | CRPA18 |
| Carlowrightia torreyana | Dianthera parvifolia (Torr.) Gray | DIPA12 |
| Carlowrightia torreyana | Schaueria parvifolia Torr. | SCPA12 |
| Carolina scalystem | Elytraria caroliniensis (J.F. Gmel.) Pers. | ELCA6 |
| Carolina scalystem | Elytraria caroliniensis (J.F. Gmel.) Pers. var. angustifolia (Fern.) Blake | ELCAA2 |
| Carolina scalystem | Elytraria caroliniensis (J.F. Gmel.) Pers. var. caroliniensis | ELCAC |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. | RUCA4 |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. ssp. caroliniensis | RUCAC2 |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. ssp. caroliniensis var. caroliniensis | RUCAC4 |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. ssp. caroliniensis var. serrulata Tharp & Barkl. | RUCAS6 |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. ssp. caroliniensis var. succulenta (Small) R.W. Long | RUCAS7 |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. ssp. ciliosa (Pursh) R.W. Long | RUCAC |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. ssp. ciliosa (Pursh) R.W. Long var. cinerascens (Fern.) Kartesz & Gandhi | RUCAC5 |
| Carolina wild petunia | Ruellia caroliniensis (J.F. Gmel.) Steud. ssp. ciliosa (Pursh) R.W. Long var. heteromorpha (Fern.) R.W. Long | RUCAH |
| Carruthers's falseface | Pseuderanthemum carruthersii (Seem.) Guillaumin | PSCA16 |
| Chinese foldwing | Dicliptera chinensis (L.) Juss. | DICH2 |
| Chinese violet | Asystasia gangetica (L.) T. Anders. | ASGA2 |
| Cooley's water-willow | Justicia cooleyi Monachino & Leonard | JUCO8 |
| Corzo's wild petunia | Ruellia corzoi Tharp & Barkl. | RUCO |
| crested Philippine violet | Barleria cristata L. | BACR |
| crossandra | Crossandra Salisb. | CROSS5 |
| Culebrita Island water-willow | Justicia culebritae Urban | JUCU |
| desert honeysuckle | Anisacanthus Nees | ANISA |
| Dicliptera brachiata | Diapedium brachiatum (Pursh) Kuntze | DIBR6 |
| Dicliptera brachiata | Dicliptera brachiata (Pursh) Spreng. var. attenuata Gray | DIBRA |
| Dicliptera brachiata | Dicliptera brachiata (Pursh) Spreng. var. glandulosa (Scheele) Fern. | DIBRG |
| Dicliptera brachiata | Dicliptera brachiata (Pursh) Spreng. var. ruthii Fern. | DIBRR |
| Dicliptera brachiata | Dicliptera glandulosa Scheele | DIGL4 |
| Dicliptera brachiata | Justicia brachiata Pursh | JUBR8 |
| Dicliptera krugii | Diapedium krugii (Urban) Britt. | DIKR2 |
| Dicliptera martinicensis | Justicia martinicensis Jacq. | JUMA9 |
| Dicliptera resupinata | Diapedium resupinatum (Vahl) Kuntze | DIRE8 |
| Dicliptera resupinata | Diapedium torreyi (Gray) Heller | DITO2 |
| Dicliptera resupinata | Dicliptera pseudoverticillaris Gray | DIPS2 |
| Dicliptera resupinata | Dicliptera torreyi Gray | DITO3 |
| Dicliptera resupinata | Justicia resupinata Vahl | JURE5 |
| Dicliptera sexangularis | Diapedium assurgens (L.) Kuntze | DIAS2 |
| Dicliptera sexangularis | Dicliptera assurgens (L.) Juss. | DIAS3 |
| Dicliptera sexangularis | Dicliptera assurgens (L.) Juss. var. vahliana (Nees) G. Maza | DIASV |
| Dicliptera sexangularis | Dicliptera vahliana Nees | DIVA4 |
| Dicliptera sexangularis | Justicia assurgens L. | JUAS2 |
| Drummond's wild petunia | Ruellia drummondiana (Nees) Gray | RUDR |
| Drushel's wild petunia | Ruellia drushelii Tharp & Barkl. | RUDR2 |
| Drushel's wild petunia | Ruellia drushelii Tharp & Barkl. var. drushelii | RUDRD |
| Drushel's wild petunia | Ruellia drushelii Tharp & Barkl. var. macrocarpa Tharp & Barkl. | RUDRM |
| dwarf desert honeysuckle | Anisacanthus puberulus (Torr.) Henrickson & Lott | ANPU6 |
| Dyschoriste angusta | Calophanes angusta Gray | CAAN21 |
| Dyschoriste angusta | Dyschoriste oblongifolia (Michx.) Kuntze var. angusta (Gray) R.W. Long | DYOBA |
| Dyschoriste humistrata | Apassalus humistratus (Michx.) Kobuski | APHU |
| Dyschoriste humistrata | Calophanes humistrata (Michx.) Shuttlw. ex Nees | CAHU4 |
| Dyschoriste humistrata | Ruellia humistrata Michx. | RUHU5 |
| Dyschoriste linearis var. linearis | Calophanes linearis (Torr. & Gray) Gray | CALI15 |
| Dyschoriste linearis var. linearis | Dipteracanthus linearis Torr. & Gray | DILI6 |
| Dyschoriste oblongifolia | Ruellia oblongifolia Michx. | RUOB5 |
| Dyschoriste schiedeana var. decumbens | Calophanes decumbens Gray | CADE18 |
| Dyschoriste schiedeana var. decumbens | Dyschoriste decumbens (Gray) Kuntze | DYDE |
| early shaggytuft | Stenandrium barbatum Torr. & Gray | STBA |
| Elytraria bromoides | Tubiflora acuminata Small | TUAC |
| Elytraria caroliniensis var. angustifolia | Elytraria virgata Michx. var. angustifolia Fern. | ELVIA4 |
| Elytraria caroliniensis var. angustifolia | Tubiflora angustifolia (Fern.) Small | TUAN2 |
| Elytraria caroliniensis var. caroliniensis | Elytraria virgata Michx. | ELVI8 |
| Elytraria caroliniensis var. caroliniensis | Tubiflora caroliniensis J.F. Gmel. | TUCA |
| Elytraria imbricata | Justicia imbricata Vahl | JUIM |
| eranthemum | Eranthemum L. | ERANT3 |
| Eranthemum pulchellum | Eranthemum nervosum (Vahl) R. Br. ex Roemer & J.A. Schultes | ERNE11 |
| false Philippine violet | Barleriola solanifolia (L.) Oerst. ex Lindau | BASO |
| false waterwillow | Andrographis echioides (L.) Nees | ANEC |
| false waterwillow | Andrographis Wallich ex Nees | ANDRO5 |
| firespike | Odontonema tubiforme (Bertol.) Kuntze | ODTU |
| foldwing | Dicliptera Juss. | DICLI |
| freshcut | Justicia pectoralis Jacq. | JUPE3 |
| fringeleaf wild petunia | Ruellia humilis Nutt. | RUHU |
| graptophyllum | Graptophyllum Nees | GRAPT4 |
| Gregg's tubetongue | Justicia pilosella (Nees) Hilsenb. | JUPI5 |
| gulf swampweed | Hygrophila lacustris (Schlecht. & Cham.) Nees | HYLA |
| hairy fournwort | Tetramerium nervosum Nees | TENE |
| hairyflower wild petunia | Ruellia ciliatiflora Hook. | RUCI3 |
| heath wrightwort | Carlowrightia linearifolia (Torr.) Gray | CALI2 |
| hemigraphis | Hemigraphis Nees | HEMIG |
| Hemigraphis reptans | Ruellia reptans Forst. f. | RURE7 |
| henrya | Henrya Nees ex Benth. | HENRY |
| Henrya insularis | Henrya brevifolia Happ | HEBR9 |
| hophead Philippine violet | Barleria lupulina Lindl. | BALU2 |
| hygrophila | Hygrophila triflora (Roxburg) F.R. Fosberg & M.-H. Sachet | HYTR6 |
| Hygrophila costata | Hygrophila brasiliensis (Spreng.) Lindau | HYBR4 |
| Hygrophila costata | Hygrophila portoricensis Nees | HYPO4 |
| Hygrophila costata | Ruellia brasiliensis Spreng. | RUBR10 |
| Hygrophila lacustris | Ruellia lacustris Schlecht. & Cham. | RULA14 |
| hypoestes | Hypoestes Soland. ex R. Br. | HYPOE |
| Indian swampweed | Hygrophila polysperma (Roxb.) T. Anders. | HYPO3 |
| island renegade | Henrya insularis Nees ex Benth. | HEIN3 |
| Justicia adhatoda | Adhatoda vasica Nees | ADVA2 |
| Justicia americana | Dianthera americana L. | DIAM2 |
| Justicia americana | Dianthera americana L. var. subcoriacea (Fern.) Shinners | DIAMS |
| Justicia americana | Justicia americana (L.) Vahl var. subcoriacea Fern. | JUAMS |
| Justicia americana | Justicia mortuifluminis Fern. | JUMO2 |
| Justicia americana | Justicia umbratilis Fern. | JUUM |
| Justicia angusta | Dianthera angusta (Chapman) Small | DIAN3 |
| Justicia angusta | Dianthera ovata Walt. var. angusta Chapman | DIOVA2 |
| Justicia angusta | Justicia ovata (Walt.) Lindau var. angusta (Chapman) R.W. Long | JUOVA |
| Justicia betonica | Nicoteba betonica (L.) Lindau | NIBE |
| Justicia brandegeeana | Beloperone guttata Brandeg. | BEGU |
| Justicia californica | Beloperone californica Benth. | BECA7 |
| Justicia candicans | Adhatoda candicans Nees | ADCA4 |
| Justicia candicans | Jacobinia candicans (Nees) Benth. & Hook. f. | JACA6 |
| Justicia candicans | Jacobinia ovata Gray | JAOV |
| Justicia carnea | Jacobinia carnea (Lindl.) G. Nicholson | JACA9 |
| Justicia comata | Dianthera comata L. | DICO8 |
| Justicia comata | Stethoma comata (L.) Britt. | STCO13 |
| Justicia crassifolia | Dianthera crassifolia Chapman | DICR4 |
| Justicia longii | Adhatoda longiflora Torr. | ADLO |
| Justicia longii | Siphonoglossa longiflora (Torr.) Gray | SILO2 |
| Justicia martinsoniana | Justicia verticillaris (Nees) Urban | JUVE |
| Justicia martinsoniana | Rhytiglossa verticillaris Nees | RHVE4 |
| Justicia martinsoniana | Stethoma verticillaris (Nees) Britt. | STVE3 |
| Justicia mirabiloides | Drejerella mirabiloides (Lam.) Lindau | DRMI2 |
| Justicia ovata var. lanceolata | Dianthera lanceolata (Chapman) Small | DILA17 |
| Justicia ovata var. lanceolata | Dianthera ovata Walt. var. lanceolata Chapman | DIOVL |
| Justicia ovata var. lanceolata | Justicia lanceolata (Chapman) Small | JULA3 |
| Justicia ovata var. ovata | Dianthera humilis (Michx.) Engelm. & Gray | DIHU2 |
| Justicia ovata var. ovata | Dianthera ovata Walt. | DIOV2 |
| Justicia ovata var. ovata | Justicia humilis Michx. | JUHU2 |
| Justicia pectoralis | Stethoma pectoralis (Jacq.) Raf. | STPE4 |
| Justicia pilosella | Adhatoda dipteracantha Nees | ADDI2 |
| Justicia pilosella | Monechma pilosella Nees | MOPI |
| Justicia pilosella | Siphonoglossa dipteracantha (Nees) Heller | SIDI6 |
| Justicia pilosella | Siphonoglossa greggii Greenm. & C.H. Thompson | SIGR5 |
| Justicia pilosella | Siphonoglossa pilosella (Nees) Torr. | SIPI |
| Justicia sphaerosperma | Justicia periplocifolia auct. non Jacq. [misapplied] | JUPE4 |
| Krug's foldwing | Dicliptera krugii Urban | DIKR |
| kwahu | Barleria opaca (Vahl) Nees | BAOP3 |
| laurel clockvine | Thunbergia laurifolia Lindl. | THLA6 |
| limestone wild petunia | Ruellia strepens L. | RUST2 |
| littleleaf wrightwort | Carlowrightia parvifolia Brandeg. | CAPA51 |
| lollipop-plant | Pachystachys lutea Nees | PALU7 |
| longflower tubetongue | Justicia longii Hilsenb. | JULO3 |
| looseflower water-willow | Justicia ovata (Walt.) Lindau | JUOV |
| looseflower water-willow | Justicia ovata (Walt.) Lindau var. lanceolata (Chapman) R.W. Long | JUOVL |
| looseflower water-willow | Justicia ovata (Walt.) Lindau var. ovata | JUOVO |
| Malabar nut | Justicia adhatoda L. | JUAD |
| marsh water-willow | Justicia comata (L.) Lam. | JUCO7 |
| Martinique foldwing | Dicliptera martinicensis (Jacq.) Juss. | DIMA23 |
| mata espiritista | Stenandrium tuberosum (L.) Urban | STTU |
| Metz's wild petunia | Ruellia metziae Tharp | RUME |
| Mexican wrightwort | Carlowrightia mexicana Henrickson & Daniel | CAME18 |
| minnieroot | Ruellia tuberosa L. | RUTU |
| mohintli | Justicia spicigera Schlect. | JUSP4 |
| Monte Cerrote water-willow | Justicia borinquensis Britt. | JUBO3 |
| Montell bractspike | Yeatesia platystegia (Torr.) Hilsenb. | YEPL |
| mottled toothedthread | Odontonema cuspidatum (Nees) Kuntze | ODCU |
| narrowleaf desert honeysuckle | Anisacanthus linearis (Hagen) Henrickson & Lott | ANLI3 |
| nelsonia | Nelsonia R. Br. | NELSO |
| Nelsonia canescens | Justicia brunelloides Lam. | JUBR9 |
| Nelsonia canescens | Nelsonia brunelloides (Lam.) Kuntze | NEBR2 |
| night and afternoon | Pseuderanthemum variabile (R. Br.) Radlk. | PSVA2 |
| nightflowering wild petunia | Ruellia noctiflora (Nees) Gray | RUNO |
| nomaphila | Nomaphila Blume | NOMAP |
| oblongleaf snakeherb | Dyschoriste oblongifolia (Michx.) Kuntze | DYOB |
| Odontonema cuspidatum | Thyrsacanthus cuspidatus Nees | THCU3 |
| Odontonema nitidum | Justicia nitida Jacq. | JUNI2 |
| Odontonema tubiforme | Odontonema strictum (Nees) Kuntze | ODST |
| Odontonema tubiforme | Thyrsacanthus strictus Nees | THST5 |
| oplonia | Oplonia Raf. | OPLON |
| Oplonia spinosa | Anthacanthus spinosus (Jacq.) Nees | ANSP6 |
| Oplonia spinosa | Justicia spinosa Jacq. | JUSP3 |
| pachystachys | Pachystachys Nees | PACHY7 |
| Parry's wild petunia | Ruellia parryi Gray | RUPA3 |
| pata de gallina | Teliostachya alopecuroidea (Vahl) Nees | TEAL |
| Peruvian wild petunia | Ruellia chartacea (T. Anders.) Wasshausen | RUCH6 |
| Philippine violet | Barleria L. | BARLE |
| pineland snakeherb | Dyschoriste angusta (Gray) Small | DYAN |
| pineland water-willow | Justicia angusta (Chapman) Small | JUAN |
| polkadot-plant | Hypoestes phyllostachya Baker | HYPH2 |
| polkadots | Dyschoriste linearis (Torr. & Gray) Kuntze | DYLI |
| polkadots | Dyschoriste linearis (Torr. & Gray) Kuntze var. linearis | DYLIL |
| porcupine flower | Barleria prionitis L. | BAPR |
| pricklybush | Oplonia spinosa (Jacq.) Raf. | OPSP4 |
| prostrate wild petunia | Ruellia prostrata Poir. | RUPR18 |
| pseuderanthemum | Pseuderanthemum Radlk. | PSEUD21 |
| Pseuderanthemum variabile | Pseuderanthemum fasciculatum auct. non (Oerst.) Leonard [misapplied] | PSFA2 |
| Pseuderanthemum variabile | Pseuderanthemum praecox auct. non (Benth.) Leonard [misapplied] | PSPR |
| Puerto Rico water-willow | Justicia martinsoniana Howard | JUMA6 |
| purple scalystem | Elytraria imbricata (Vahl) Pers. | ELIM |
| Pursh's wild petunia | Ruellia purshiana Fern. | RUPU2 |
| redflame | Hemigraphis reptans (G. Forst.) T. Anders. ex Hemsl. | HERE6 |
| redivy | Hemigraphis alternata (Burm. f.) T. Anders. | HEAL12 |
| Rio Grande wild petunia | Ruellia davisiorum Tharp & Barkl. | RUDA |
| Ruellia brevifolia | Ruellia graecizans Backer | RUGR8 |
| Ruellia caerulea | Ruellia brittoniana Leonard | RUBR |
| Ruellia caerulea | Ruellia malacosperma sensu Small, non Greenm. | RUMA18 |
| Ruellia caerulea | Ruellia tweediana auct. non Griseb. [misapplied] | RUTW |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Pattersonia caroliniensis J.F. Gmel. | PACA14 |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia caroliniensis (J.F. Gmel.) Steud. var. cheloniformis Fern. | RUCAC6 |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia caroliniensis (J.F. Gmel.) Steud. var. dentata (Nees) Fern. | RUCAD |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia caroliniensis (J.F. Gmel.) Steud. var. membranacea Fern. | RUCAM |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia caroliniensis (J.F. Gmel.) Steud. var. nanella Fern. | RUCAN |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia caroliniensis (J.F. Gmel.) Steud. var. parviflora (Nees) Blake | RUCAP |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia caroliniensis (J.F. Gmel.) Steud. var. salicina Fern. | RUCAS4 |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia caroliniensis (J.F. Gmel.) Steud. var. semicalva Fern. | RUCAS5 |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia hybrida Pursh | RUHY3 |
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Ruellia parviflora (Nees) Britt. | RUPA21 |
| Ruellia caroliniensis ssp. caroliniensis var. succulenta | Ruellia succulenta Small | RUSU6 |
| Ruellia caroliniensis ssp. ciliosa var. cinerascens | Ruellia ciliosa Pursh | RUCI4 |
| Ruellia caroliniensis ssp. ciliosa var. cinerascens | Ruellia ciliosa Pursh var. cinerascens Fern. | RUCIC |
| Ruellia caroliniensis ssp. ciliosa var. cinerascens | Ruellia humilis sensu Small, non Nutt. | RUHU6 |
| Ruellia caroliniensis ssp. ciliosa var. heteromorpha | Ruellia heteromorpha Fern. | RUHE4 |
| Ruellia caroliniensis ssp. ciliosa var. heteromorpha | Ruellia hybrida sensu Small, non Pursh | RUHY4 |
| Ruellia ciliatiflora | Ruellia lorentziana Griseb. | RULO7 |
| Ruellia coccinea | Barleria coccinea L. | BACO4 |
| Ruellia drummondiana | Dipteracanthus drummondianus Nees | DIDR2 |
| Ruellia drushelii var. drushelii | Ruellia nudiflora (Engelm. & Gray) Urban var. humilis (Nees) Leonard | RUNUH2 |
| Ruellia humilis | Ruellia ciliosa Pursh var. longiflora Gray | RUCIL |
| Ruellia humilis | Ruellia humilis Nutt. var. calvescens Fern. | RUHUC |
| Ruellia humilis | Ruellia humilis Nutt. var. depauperata Tharp & Barkl. | RUHUD |
| Ruellia humilis | Ruellia humilis Nutt. var. expansa Fern. | RUHUE |
| Ruellia humilis | Ruellia humilis Nutt. var. frondosa Fern. | RUHUF |
| Ruellia humilis | Ruellia humilis Nutt. var. longiflora (Gray) Fern. | RUHUL |
| Ruellia metziae | Ruellia metziae Tharp var. marshii Tharp & Barkl. | RUMEM2 |
| Ruellia metziae | Ruellia muelleri Tharp & Barkl. | RUMU6 |
| Ruellia nudiflora var. nudiflora | Dipteracanthus nudiflorus Engelm. & Gray | DINU2 |
| Ruellia nudiflora var. nudiflora | Ruellia nudiflora (Engelm. & Gray) Urban var. glabrata Leonard | RUNUG |
| Ruellia nudiflora var. nudiflora | Ruellia nudiflora (Engelm. & Gray) Urban var. hispidula Shinners | RUNUH |
| Ruellia nudiflora var. nudiflora | Ruellia tuberosa sensu Gray | RUTU3 |
| Ruellia nudiflora var. runyonii | Ruellia runyonii Tharp & Barkl. | RURU |
| Ruellia nudiflora var. runyonii | Ruellia runyonii Tharp & Barkl. var. berlandieri Tharp & Barkl. | RURUB |
| Ruellia occidentalis | Ruellia nudiflora (Engelm. & Gray) Urban var. occidentalis (Gray) Leonard | RUNUO |
| Ruellia occidentalis | Ruellia strictopaniculata Tharp & Barkl. | RUST8 |
| Ruellia occidentalis | Ruellia tuberosa L. var. occidentalis Gray | RUTUO |
| Ruellia pedunculata ssp. pinetorum | Ruellia pinetorum Fern. | RUPI2 |
| Ruellia strepens | Dipteracanthus micranthus Engelm. & Gray | DIMI4 |
| Ruellia strepens | Dipteracanthus strepens (L.) Nees | DIST4 |
| Ruellia strepens | Ruellia strepens L. var. cleistantha Gray | RUSTC |
| Ruellia strepens | Ruellia strepens L. var. micrantha (Engelm. & Gray) Britt. | RUSTM |
| Ruellia yucatana | Ruellia nudiflora (Engelm. & Gray) Urban var. yucatana Leonard | RUNUY |
| Runyon's water-willow | Justicia runyonii Small | JURU2 |
| Runyon's wild petunia | Ruellia nudiflora (Engelm. & Gray) Urban var. runyonii (Tharp & Barkl.) B.L. Turner | RUNUR |
| sanchezia | Sanchezia Ruiz & Pav?n | SANCH |
| scalystem | Elytraria Michx. | ELYTR |
| Schied's snakeherb | Dyschoriste schiedeana (Nees) Kuntze | DYSC |
| shaggytuft | Stenandrium Nees | STENA |
| shrimpplant | Justicia brandegeeana Wasshausen & L.B. Sm. | JUBR6 |
| shrubby toothedthread | Odontonema nitidum (Jacq.) Kuntze | ODNI |
| shrubby whitevein | Sanchezia speciosa Leonard | SASP7 |
| Siphonoglossa sessilis | Justicia sessilis Jacq. | JUSE2 |
| sixangle foldwing | Dicliptera sexangularis (L.) Juss. | DISE9 |
| smallflower wrightwort | Carlowrightia parviflora (Buckl.) Wasshausen | CAPA42 |
| snakeherb | Dyschoriste Nees | DYSCH |
| softseed wild petunia | Ruellia malacosperma Greenm. | RUMA9 |
| Sonoran water-willow | Justicia sonorae Wasshausen | JUSO |
| spine acanthus | Acanthus spinosus L. | ACSP7 |
| spreading snakeherb | Dyschoriste schiedeana (Nees) Kuntze var. decumbens (Gray) Henrickson | DYSCD |
| squirrel's tail | Justicia betonica L. | JUBE2 |
| stalked wild petunia | Ruellia pedunculata Torr. ex Gray | RUPE4 |
| stalked wild petunia | Ruellia pedunculata Torr. ex Gray ssp. pedunculata | RUPEP2 |
| stalked wild petunia | Ruellia pedunculata Torr. ex Gray ssp. pinetorum (Fern.) R.W. Long | RUPEP |
| starhorn | Hygrophila corymbosa (Blume) Lindau | HYCO8 |
| Stenandrium barbatum | Gerardia barbata (Torr. & Gray) Blake | GEBA5 |
| Stenandrium dulce var. dulce | Crossandra fascicularis auct. non Benth. [misapplied] | CRFA3 |
| Stenandrium dulce var. dulce | Gerardia dulcis (Cav.) Nees | GEDU2 |
| Stenandrium dulce var. dulce | Ruellia dulcis Cav. | RUDU3 |
| Stenandrium dulce var. dulce | Stenandrium fasciculare auct. non (Benth.) Wasshausen [misapplied] | STFA |
| Stenandrium dulce var. floridanum | Gerardia dulcis (Cav.) Nees var. floridana (Gray) Blake | GEDUF |
| Stenandrium dulce var. floridanum | Gerardia floridana (Gray) Small | GEFL3 |
| Stenandrium dulce var. floridanum | Stenandrium floridanum (Gray) Small | STFL |
| Stenandrium tuberosum | Gerardia portoricensis Britt. & P. Wilson | GEPO4 |
| Stenandrium tuberosum | Gerardia tuberosa L. | GETU2 |
| stiff beargrass | Nomaphila stricta (Vahl) Nees | NOST3 |
| swamp snakeherb | Dyschoriste humistrata (Michx.) Kuntze | DYHU |
| swampweed | Hygrophila R. Br. | HYGRO |
| sweet shaggytuft | Stenandrium dulce (Cav.) Nees | STDU2 |
| sweet shaggytuft | Stenandrium dulce (Cav.) Nees var. dulce | STDUD |
| Syrian acanthus | Acanthus syriacus Boiss. | ACSY |
| teliostachya | Teliostachya Nees | TELIO |
| Teliostachya alopecuroidea | Lepidagathis alopecuroidea (Vahl) R. Br. ex Griseb. | LEAL9 |
| Teliostachya alopecuroidea | Ruellia alopecuroidea Vahl | RUAL15 |
| tetramerium | Tetramerium Nees | TETRA6 |
| Tetramerium nervosum | Tetramerium hispidum Nees | TEHI |
| Tetramerium nervosum | Tetramerium nervosum Nees var. hispidum (Nees) Torr. | TENEH |
| Texas wrightwort | Carlowrightia texana Henrickson & Daniel | CATE15 |
| thicketwort | Oplonia microphylla (Lam.) Stearn | OPMI |
| thickleaf water-willow | Justicia crassifolia (Chapman) Chapman ex Small | JUCR |
| thunbergia | Thunbergia Retz. | THUNB |
| Thunbergia erecta | Meyenia erecta Benth. | MEER3 |
| Thunbergia fragrans | Thunbergia volubilis Pers. | THVO |
| Thurber's desert honeysuckle | Anisacanthus thurberi (Torr.) Gray | ANTH2 |
| toothedthread | Odontonema Nees | ODONT5 |
| Torrey's wrightwort | Carlowrightia torreyana Wasshausen | CATO13 |
| TransPecos wrightwort | Carlowrightia serpyllifolia Gray | CASE3 |
| tropical tubetongue | Siphonoglossa sessilis (Jacq.) D. Gibson | SISE6 |
| tropical waterwillow | Justicia sphaerosperma Vahl. | JUSP5 |
| tropical wild petunia | Ruellia brevifolia (Pohl) Ezcurra | RUBR12 |
| tubetongue | Siphonoglossa Oerst. | SIPHO |
| Turner's water-willow | Justicia turneri Hilsenb. | JUTU3 |
| violet wild petunia | Ruellia nudiflora (Engelm. & Gray) Urban | RUNU |
| violet wild petunia | Ruellia nudiflora (Engelm. & Gray) Urban var. nudiflora | RUNUN |
| Warnock's water-willow | Justicia warnockii B.L. Turner | JUWA |
| water-willow | Justicia L. | JUSTI |
| wavyleaf snakeherb | Dyschoriste crenulata Kobuski | DYCR |
| West Indian water-willow | Justicia mirabiloides Lam. | JUMI3 |
| western wild petunia | Ruellia occidentalis (Gray) Tharp & Barkl. | RUOC4 |
| wheatspike scalystem | Elytraria bromoides Oerst. | ELBR2 |
| whitelady | Thunbergia fragrans Roxb. | THFR2 |
| wild petunia | Ruellia L. | RUELL |
| woodland water-willow | Justicia carthagenensis Jacq. | JUCA10 |
| Wright's desert honeysuckle | Anisacanthus quadrifidus (Vahl) Nees | ANQU2 |
| Wright's desert honeysuckle | Anisacanthus quadrifidus (Vahl) Nees var. wrightii (Torr.) Henrickson | ANQUW |
| Wright's waterwillow | Justicia wrightii Gray | JUWR |
| wrightwort | Carlowrightia Gray | CARLO |
| Yeatesia platystegia | Tetramerium platystegium Torr. | TEPL |
| Yeatesia viridiflora | Dicliptera halei Riddell | DIHA3 |
| Yeatesia viridiflora | Dicliptera viridiflora (Nees) R.W. Long | DIVI8 |
| Yeatesia viridiflora | Gatesia laetevirens (Buckl.) Gray | GALA9 |
| Yeatesia viridiflora | Justicia laetevirens Buckl. | JULA2 |
| Yeatesia viridiflora | Rhytiglossa viridiflora Nees | RHVI4 |
| Yeatesia viridiflora | Yeatesia laetevirens (Buckl.) Small | YELA |
| yellow bractspike | Yeatesia viridiflora (Nees) Small | YEVI |
| yerba de hicotea | Hygrophila costata Nees | HYCO9 |
| yerba maravilla | Ruellia coccinea (L.) Vahl | RUCO5 |
| Yucatan wild petunia | Ruellia yucatana (Leonard) Tharp & Barkl. | RUYU |