| Common Name | Scientific Name | Code |
| n/a | Linum perenne L. ssp. anglicum (Mill.) Ockendon | LIPEA2 |
| Allen Springs dwarf-flax | Hesperolinon clevelandii (Greene) Small | HECL3 |
| allseed | Radiola linoides Roth | RALI |
| alpine flax | Linum perenne L. ssp. alpinum (Jacq.) Stoj. & Stef. | LIPEA3 |
| Berlandier's yellow flax | Linum berlandieri Hook. | LIBE2 |
| Berlandier's yellow flax | Linum berlandieri Hook. var. berlandieri | LIBEB2 |
| Berlandier's yellow flax | Linum berlandieri Hook. var. filifolium (Shinners) Rogers | LIBEF |
| blue flax | Linum perenne L. | LIPE2 |
| Brewer's dwarf-flax | Hesperolinon breweri (Gray) Small | HEBR4 |
| bristle flax | Linum aristatum Engelm. | LIAR3 |
| California dwarf-flax | Hesperolinon californicum (Benth.) Small | HECA11 |
| Carter's flax | Linum carteri Small | LICA14 |
| Carter's flax | Linum carteri Small var. carteri | LICAC3 |
| Chihuahuan flax | Linum vernale Woot. | LIVE2 |
| Coast Range dwarf-flax | Hesperolinon disjunctum H.K. Sharsmith | HEDI4 |
| common flax | Linum usitatissimum L. | LIUS |
| digynum flax | Sclerolinon digynum (Gray) Rogers | SCDI5 |
| drymary dwarf-flax | Hesperolinon drymarioides (Curran) Small | HEDR4 |
| dwarf-flax | Hesperolinon (Gray) Small | HESPE7 |
| fairy flax | Linum catharticum L. | LICA9 |
| flax | Linum L. | LINUM |
| flax | Linum narbonense L. | LINA2 |
| Florida yellow flax | Linum floridanum (Planch.) Trel. | LIFL |
| Florida yellow flax | Linum floridanum (Planch.) Trel. var. chrysocarpum Rogers | LIFLC |
| Florida yellow flax | Linum floridanum (Planch.) Trel. var. floridanum | LIFLF2 |
| flowering flax | Linum grandiflorum Desf. | LIGR4 |
| French flax | Linum trigynum L. | LITR4 |
| glandular dwarf-flax | Hesperolinon adenophyllum (Gray) Small | HEAD |
| grooved flax | Linum sulcatum Riddell | LISU4 |
| grooved flax | Linum sulcatum Riddell var. sulcatum | LISUS |
| Harper's flax | Linum sulcatum Riddell var. harperi (Small) Rogers | LISUH |
| Hesperolinon adenophyllum | Linum adenophyllum Gray | LIAD2 |
| Hesperolinon bicarpellatum | Linum bicarpellatum H.K. Sharsmith | LIBI7 |
| Hesperolinon breweri | Linum breweri Gray | LIBR7 |
| Hesperolinon californicum | Linum californicum Benth. | LICA26 |
| Hesperolinon californicum | Linum californicum Benth. var. confertum Gray ex Trel. | LICAC5 |
| Hesperolinon clevelandii | Linum clevelandii Greene | LICL2 |
| Hesperolinon clevelandii | Linum clevelandii Greene var. petrophilum Jepson | LICLP |
| Hesperolinon congestum | Linum californicum Benth. var. congestum (Gray) Jepson | LICAC6 |
| Hesperolinon congestum | Linum congestum Gray | LICO13 |
| Hesperolinon drymarioides | Linum drymarioides Curran | LIDR2 |
| Hesperolinon micranthum | Linum micranthum Gray | LIMI10 |
| Hesperolinon spergulinum | Linum spergulinum Gray | LISP7 |
| King's flax | Linum kingii S. Wats. | LIKI2 |
| Lake County dwarf-flax | Hesperolinon didymocarpum H.K. Sharsmith | HEDI3 |
| Laredo flax | Linum elongatum (Small) Winkl. | LIEL3 |
| Lewis flax | Linum lewisii Pursh | LILE3 |
| Linum alatum | Cathartolinum alatum Small | CAAL24 |
| Linum alatum | Mesynium alatum (Small) W.A. Weber | MEAL11 |
| Linum arenicola | Cathartolinum arenicola Small | CAAR23 |
| Linum aristatum | Cathartolinum aristatum (Engelm.) Small | CAAR40 |
| Linum aristatum | Mesynium aristatum (Engelm.) W.A. Weber | MEAR9 |
| Linum australe var. australe | Cathartolinum australe (Heller) Small | CAAU12 |
| Linum australe var. australe | Linum aristatum Engelm. var. australe (Heller) Kearney & Peebles | LIARA2 |
| Linum australe var. australe | Mesynium australe (Heller) W.A. Weber | MEAU2 |
| Linum australe var. glandulosum | Mesynium australe (Heller) W.A. Weber ssp. glandulosum (Rogers) W.A. Weber | MEAUG |
| Linum berlandieri var. berlandieri | Cathartolinum berlandieri (Hook.) Small | CABE10 |
| Linum berlandieri var. berlandieri | Cathartolinum sanctum (Small) Small | CASA16 |
| Linum berlandieri var. berlandieri | Linum rigidum Pursh var. berlandieri (Hook.) Torr. & Gray | LIRIB |
| Linum berlandieri var. berlandieri | Linum sanctum Small | LISA4 |
| Linum berlandieri var. filifolium | Linum rigidum Pursh var. filifolium Shinners | LIRIF |
| Linum bienne | Linum angustifolium Huds. | LIAN8 |
| Linum carteri var. carteri | Cathartolinum carteri (Small) Small | CACA53 |
| Linum carteri var. carteri | Linum rigidum Pursh var. carteri (Small) Rogers | LIRIC2 |
| Linum catharticum | Cathartolinum catharticum (L.) Small | CACA55 |
| Linum compactum | Cathartolinum compactum (A. Nels.) Small | CACO46 |
| Linum compactum | Linum rigidum Pursh var. compactum (A. Nels.) Rogers | LIRIC |
| Linum elongatum | Cathartolinum elongatum Small | CAEL12 |
| Linum floridanum var. floridanum | Cathartolinum floridanum (Planch.) Small | CAFL29 |
| Linum floridanum var. floridanum | Cathartolinum macrosepalum Small | CAMA26 |
| Linum floridanum var. floridanum | Linum virginianum L. var. floridanum Planch. | LIVIF |
| Linum grandiflorum | Adenolinum grandiflorum (Desf.) W.A. Weber | ADGR |
| Linum grandiflorum | Linum grandiflorum Desf. var. rubrum hort. | LIGRR2 |
| Linum hudsonioides | Cerastium clawsonii Correll | CECL |
| Linum hudsonioides | Mesynium hudsonioides (Planch.) W.A. Weber | MEHU4 |
| Linum imbricatum | Cathartolinum multicaule (Hook.) Small | CAMU17 |
| Linum imbricatum | Mesynium imbricatum (Raf.) W.A. Weber | MEIM2 |
| Linum imbricatum | Nezera imbricata Raf. | NEIM |
| Linum intercursum | Cathartolinum intercursum (Bickn.) Small | CAIN34 |
| Linum kingii | Cathartolinum kingii (S. Wats.) Small | CAKI2 |
| Linum kingii | Cathartolinum sedoides (Porter) Small | CASE25 |
| Linum kingii | Linum kingii S. Wats. var. pinetorum M.E. Jones | LIKIP |
| Linum kingii | Linum kingii S. Wats. var. sedoides Porter | LIKIS2 |
| Linum kingii | Mesyniopsis kingii (S. Wats.) W.A. Weber | MEKI2 |
| Linum lewisii var. alpicola | Linum lewisii Pursh var. saxosum Maguire & A. Holmgren | LILES |
| Linum lewisii var. lewisii | Adenolinum lewisii (Pursh) A.& D. L?ve | ADLE |
| Linum lewisii var. lewisii | Linum perenne L. ssp. lewisii (Pursh) Hult | LIPEL3 |
| Linum lewisii var. lewisii | Linum perenne L. var. lewisii (Pursh) Eat. & J. Wright | LIPEL2 |
| Linum medium var. medium | Cathartolinum medium (Planch.) Small | CAME26 |
| Linum medium var. medium | Linum striatum Walt. var. medium (Planch.) Boivin | LISTM |
| Linum medium var. medium | Linum virginianum L. var. medium Planch. | LIVIM |
| Linum medium var. texanum | Cathartolinum curtissii (Small) Small | CACU12 |
| Linum medium var. texanum | Linum striatum Walt. var. texanum (Planch.) Boivin | LISTT |
| Linum medium var. texanum | Linum virginianum L. var. texanum Planch. | LIVIT |
| Linum neomexicanum | Cathartolinum neomexicanum (Greene) Small | CANE23 |
| Linum perenne | Linum lewisii auct. non Pursh [misapplied] | LILE10 |
| Linum pratense | Adenolinum pratense (Norton) W.A. Weber | ADPR |
| Linum pratense | Linum lewisii Pursh var. pratense J.B.S. Norton | LILEP |
| Linum puberulum | Cathartolinum puberulum (Engelm.) Small | CAPU29 |
| Linum puberulum | Linum rigidum Pursh var. puberulum Engelm. | LIRIP2 |
| Linum puberulum | Mesynium puberulum (Engelm.) W.A. Weber | MEPU9 |
| Linum rigidum var. rigidum | Cathartolinum earlei Small | CAEA3 |
| Linum rigidum var. rigidum | Cathartolinum rigidum (Pursh) Small | CARI10 |
| Linum rigidum var. rigidum | Mesynium rigidum (Pursh) A.& D. L?ve | MERI2 |
| Linum schiedeanum | Linum greggii Engelm. | LIGR12 |
| Linum striatum | Cathartolinum striatum (Walt.) Small | CAST31 |
| Linum striatum | Linum striatum Walt. var. multijugum Fern. | LISTM2 |
| Linum striatum | Nezera striata (Walt.) Nieuwl. | NEST3 |
| Linum subteres | Linum aristatum Engelm. var. subteres Trel. | LIARS2 |
| Linum subteres | Linum leptopoda A. Nels. | LILE5 |
| Linum subteres | Mesynium subteres (Trel.) W.A. Weber | MESU7 |
| Linum sulcatum var. harperi | Cathartolinum harperi (Small) Small | CAHA25 |
| Linum sulcatum var. harperi | Linum harperi Small | LIHA4 |
| Linum sulcatum var. sulcatum | Cathartolinum sulcatum (Riddell) Small | CASU28 |
| Linum sulcatum var. sulcatum | Mesynium sulcatum (Riddell) A.& D. L?ve | MESU8 |
| Linum trigynum | Linum gallicum L. | LIGA4 |
| Linum usitatissimum | Linum humile P. Mill. | LIHU3 |
| Linum usitatissimum | Linum usitatissimum L. var. humile (P. Mill.) Pers. | LIUSH |
| Linum vernale | Cathartolinum vernale (Woot.) Small | CAVE12 |
| Linum vernale | Mesynium vernale (Woot.) W.A. Weber | MEVE4 |
| Linum virginianum | Cathartolinum virginianum (L.) Reichenb. | CAVI15 |
| Linum virginianum | Nezera virginiana (L.) Nieuwl. | NEVI |
| Marin dwarf-flax | Hesperolinon congestum (Gray) Small | HECO12 |
| meadow flax | Linum pratense (J.B.S. Norton) Small | LIPR |
| Napa dwarf-flax | Hesperolinon serpentinum N. McCarten ined. | HESE8 |
| New Mexico yellow flax | Linum neomexicanum Greene | LINE |
| pale flax | Linum bienne P. Mill. | LIBI5 |
| Paskenta Grade dwarf-flax | Hesperolinon tehamense H.K. Sharsmith | HETE8 |
| plains flax | Linum puberulum (Engelm.) Heller | LIPU4 |
| prairie flax | Linum lewisii Pursh var. alpicola Jepson | LILEA |
| prairie flax | Linum lewisii Pursh var. lewisii | LILEL2 |
| radiola | Radiola Hill | RADIO |
| Radiola linoides | Millegrana radiola (L.) Druce | MIRA3 |
| ridged yellow flax | Linum striatum Walt. | LIST |
| rock flax | Linum rupestre (Gray) Engelm. ex Gray | LIRU2 |
| sand flax | Linum arenicola (Small) Winkl. | LIAR5 |
| sandplain flax | Linum intercursum Bickn. | LIIN |
| Schied's flax | Linum schiedeanum Schlecht. & Cham. | LISC5 |
| sclerolinon | Sclerolinon Rogers | SCLER9 |
| Sclerolinon digynum | Linum digynum Gray | LIDI3 |
| slender dwarf-flax | Hesperolinon spergulinum (Gray) Small | HESP5 |
| Small's flax | Linum carteri Small var. smallii Rogers | LICAS |
| smallflower dwarf-flax | Hesperolinon micranthum (Gray) Small | HEMI9 |
| southern flax | Linum australe Heller | LIAU4 |
| southern flax | Linum australe Heller var. australe | LIAUA |
| southern flax | Linum australe Heller var. glandulosum Rogers | LIAUG |
| Spring Hill flax | Linum macrocarpum Rogers | LIMA10 |
| sprucemont flax | Linum subteres (Trel.) Winkl. | LISU5 |
| stiff yellow flax | Linum medium (Planch.) Britt. | LIME2 |
| stiff yellow flax | Linum medium (Planch.) Britt. var. medium | LIMEM |
| stiff yellow flax | Linum medium (Planch.) Britt. var. texanum (Planch.) Fern. | LIMET |
| stiffstem flax | Linum rigidum Pursh | LIRI |
| stiffstem flax | Linum rigidum Pursh var. rigidum | LIRIR |
| stiffstem flax | Linum rigidum Pursh var. simulans Rogers | LIRIS |
| Sullivan City flax | Linum lundellii Rogers | LILU |
| Texas flax | Linum hudsonioides Planch. | LIHU2 |
| tufted flax | Linum imbricatum (Raf.) Shinners | LIIM |
| twocarpel dwarf-flax | Hesperolinon bicarpellatum (H.K. Sharsmith) H.K. Sharsmith | HEBI3 |
| West's flax | Linum westii Rogers | LIWE |
| winged flax | Linum alatum (Small) Winkl. | LIAL2 |
| woodland flax | Linum virginianum L. | LIVI |
| Wyoming flax | Linum compactum A. Nels. | LICO3 |