| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| OEJA | Oenothera jamesii Torr. & Gray | trumpet evening-primrose | Onagraceae
|
| OEKEG | Oenothera kernensis Munz ssp. gilmanii (Munz) Munz | Camissonia kernensis ssp. gilmanii | Onagraceae
|
| OEKEM | Oenothera kernensis Munz ssp. mojavensis Munz | Camissonia kernensis ssp. gilmanii | Onagraceae
|
| OEKE2 | Oenothera kernensis Munz | Camissonia kernensis ssp. kernensis | Onagraceae
|
| OEKL | Oenothera ?kleinii W.L. Wagner & S. Mill. | Wolf Creek evening-primrose | Onagraceae
|
| OEKU | Oenothera kunthiana (Spach) Munz | Kunth's evening-primrose | Onagraceae
|
| OELAP | Oenothera laciniata Hill ssp. pubescens (Willd. ex Spreng.) Munz | Oenothera pubescens | Onagraceae
|
| OELAG2 | Oenothera laciniata Hill var. grandiflora (S. Wats.) B.L. Robins. | Oenothera grandis | Onagraceae
|
| OELAP2 | Oenothera laciniata Hill var. pubescens (Willd. ex Spreng.) Munz | Oenothera pubescens | Onagraceae
|
| OELA | Oenothera laciniata Hill | cutleaf evening-primrose | Onagraceae
|
| OELA2 | Oenothera latifolia (Rydb.) Munz | mountain evening-primrose | Onagraceae
|
| OELAG3 | Oenothera lavandulifolia Torr. & Gray var. glandulosa Munz | Calylophus lavandulifolius | Onagraceae
|
| OELAT | Oenothera lavandulifolia Torr. & Gray var. typica Munz | Calylophus lavandulifolius | Onagraceae
|
| OELA5 | Oenothera lavandulifolia Torr. & Gray | Calylophus lavandulifolius | Onagraceae
|
| OELE2 | Oenothera leptocarpa Greene | Camissonia californica | Onagraceae
|
| OELIG | Oenothera linifolia Nutt. var. glandulosa Munz | Oenothera linifolia | Onagraceae
|
| OELI | Oenothera linifolia Nutt. | threadleaf evening-primrose | Onagraceae
|
| OELOC | Oenothera longissima Rydb. ssp. clutei (A. Nels.) Munz | Oenothera longissima | Onagraceae
|
| OELOT | Oenothera longissima Rydb. ssp. typica Munz | Oenothera longissima | Onagraceae
|
| OELOC2 | Oenothera longissima Rydb. var. clutei (A. Nels.) Munz | Oenothera longissima | Onagraceae
|
| OELO | Oenothera longissima Rydb. | longstem evening-primrose | Onagraceae
|
| OEMAF | Oenothera macrocarpa Nutt. ssp. fremontii (S. Wats.) W.L. Wagner | Fremont's evening-primrose | Onagraceae
|
| OEMAI2 | Oenothera macrocarpa Nutt. ssp. incana (Gray) Wagner | bigfruit evening-primrose | Onagraceae
|
| OEMAM | Oenothera macrocarpa Nutt. ssp. macrocarpa | bigfruit evening-primrose | Onagraceae
|
| OEMAO2 | Oenothera macrocarpa Nutt. ssp. oklahomensis (J.B.S. Norton) Wagner | Oklahoma evening-primrose | Onagraceae
|
| OEMAI | Oenothera macrocarpa Nutt. var. incana (Gray) Reveal | Oenothera macrocarpa ssp. incana | Onagraceae
|
| OEMAO | Oenothera macrocarpa Nutt. var. oklahomensis (J.B.S. Norton) Reveal | Oenothera macrocarpa ssp. oklahomensis | Onagraceae
|
| OEMA | Oenothera macrocarpa Nutt. | bigfruit evening-primrose | Onagraceae
|
| OEMA3 | Oenothera macrosiphon Woot. & Standl. | Oenothera organensis | Onagraceae
|
| OEME2 | Oenothera megalantha (Munz) Raven | Camissonia megalantha | Onagraceae
|
| OEME | Oenothera mexicana Spach | Mexican evening-primrose | Onagraceae
|
| OEMIE | Oenothera micrantha Hornem. ex Spreng. var. exfoliata (A. Nels.) Munz | Camissonia pallida ssp. pallida | Onagraceae
|
| OEMII3 | Oenothera micrantha Hornem. ex Spreng. var. ignota Jepson | Camissonia ignota | Onagraceae
|
| OEMIJ | Oenothera micrantha Hornem. ex Spreng. var. jonesii (Levl.) Munz | Camissonia hirtella | Onagraceae
|
| OEMI4 | Oenothera micrantha Hornem. ex Spreng. | Camissonia micrantha | Onagraceae
|
| OEMIC | Oenothera minor (A. Nels.) Munz var. cusickii Munz | Camissonia minor | Onagraceae
|
| OEMI6 | Oenothera minor (A. Nels.) Munz | Camissonia minor | Onagraceae
|
| OEMII2 | Oenothera missouriensis Sims var. incana Gray | Oenothera macrocarpa ssp. incana | Onagraceae
|
| OEMIO2 | Oenothera missouriensis Sims var. oklahomensis (J.B.S. Norton) Munz | Oenothera macrocarpa ssp. oklahomensis | Onagraceae
|
| OEMI5 | Oenothera missouriensis Sims | Oenothera macrocarpa ssp. macrocarpa | Onagraceae
|
| OEMO | Oenothera mollissima L. | Argentine evening-primrose | Onagraceae
|
| OEMUO | Oenothera multijuga S. Wats. var. orientalis Munz | Camissonia walkeri ssp. walkeri | Onagraceae
|
| OEMUP2 | Oenothera multijuga S. Wats. var. parviflora (S. Wats.) Munz | Camissonia multijuga | Onagraceae
|
| OEMUT | Oenothera multijuga S. Wats. var. typica Munz | Camissonia multijuga | Onagraceae
|
| OEMU4 | Oenothera multijuga S. Wats. | Camissonia multijuga | Onagraceae
|
| OEMU3 | Oenothera munzii Raven | Camissonia munzii | Onagraceae
|
| OEMU2 | Oenothera muricata L. | Oenothera biennis | Onagraceae
|
| OENE | Oenothera neomexicana (Small) Munz | New Mexico evening-primrose | Onagraceae
|
| OENE2 | Oenothera nevadensis Kellogg | Camissonia nevadensis | Onagraceae
|
| OENU2 | Oenothera nutans Atkinson & Bartlett | nodding evening-primrose | Onagraceae
|
| OENU | Oenothera nuttallii Sweet | Nuttall's evening-primrose | Onagraceae
|
| OEOA | Oenothera oakesiana (Gray) J.W. Robbins ex S. Wats. & Coult. | Oakes' evening-primrose | Onagraceae
|
| OEOR | Oenothera organensis Munz | Organ Mountain evening-primrose | Onagraceae
|
| OEOR2 | Oenothera ornata (A. Nels.) Rydb. | Oenothera elata ssp. hirsutissima | Onagraceae
|
| OEOV2 | Oenothera ovata Nutt. ex Torr. & Gray | Camissonia ovata | Onagraceae
|
| OEPAG | Oenothera pallida Lindl. ssp. gypsophila (Eastw.) Munz & W. Klein | whitepole evening-primrose | Onagraceae
|
| OEPAL | Oenothera pallida Lindl. ssp. latifolia (Rydb.) Munz | Oenothera latifolia | Onagraceae
|
| OEPAP | Oenothera pallida Lindl. ssp. pallida | pale evening-primrose | Onagraceae
|
| OEPAR | Oenothera pallida Lindl. ssp. runcinata (Engelm.) Munz & W. Klein | pale evening-primrose | Onagraceae
|
| OEPAT | Oenothera pallida Lindl. ssp. trichocalyx (Nutt.) Munz & W. Klein | pale evening-primrose | Onagraceae
|
| OEPAI | Oenothera pallida Lindl. var. idahoensis Munz | Oenothera pallida ssp. pallida | Onagraceae
|
| OEPAR2 | Oenothera pallida Lindl. var. runcinata (Engelm.) Cronq. | Oenothera pallida ssp. runcinata | Onagraceae
|
| OEPAT3 | Oenothera pallida Lindl. var. trichocalyx (Nutt.) Dorn | Oenothera pallida ssp. trichocalyx | Onagraceae
|
| OEPAT2 | Oenothera pallida Lindl. var. typica Munz | Oenothera pallida ssp. pallida | Onagraceae
|
| OEPA | Oenothera pallida Lindl. | pale evening-primrose | Onagraceae
|
| OEPA8 | Oenothera pallidula (Munz) Munz | Camissonia brevipes ssp. pallidula | Onagraceae
|
| OEPA7 | Oenothera palmeri S. Wats. | Camissonia palmeri | Onagraceae
|
| OEPA9 | Oenothera parryi S. Wats. | Camissonia parryi | Onagraceae
|
| OEPAA | Oenothera parviflora L. ssp. angustissima (R.R. Gates) Munz | Oenothera oakesiana | Onagraceae
|
| OEPAA2 | Oenothera parviflora L. var. angustissima (R.R. Gates) Wieg. | Oenothera oakesiana | Onagraceae
|
| OEPAO | Oenothera parviflora L. var. oakesiana (Gray) Fern. | Oenothera oakesiana | Onagraceae
|
| OEPA5 | Oenothera parviflora L. | northern evening-primrose | Onagraceae
|
| OEPA6 | Oenothera parvula Nutt. ex Torr. & Gray | Camissonia parvula | Onagraceae
|
| OEPER | Oenothera perennis L. var. rectipilis (Blake) Blake | Oenothera perennis | Onagraceae
|
| OEPET | Oenothera perennis L. var. typica Munz | Oenothera perennis | Onagraceae
|
| OEPE | Oenothera perennis L. | little evening-primrose | Onagraceae
|
| OEPIP | Oenothera pilosella Raf. ssp. pilosella | meadow evening-primrose | Onagraceae
|
| OEPIS | Oenothera pilosella Raf. ssp. sessilis (Pennell) Straley | meadow evening-primrose | Onagraceae
|
| OEPI2 | Oenothera pilosella Raf. | meadow evening-primrose | Onagraceae
|
| OEPL | Oenothera platanorum Raven & Parnell | Fort Huachuca evening-primrose | Onagraceae
|
| OEPRB | Oenothera primiveris Gray ssp. bufonis (M.E. Jones) Munz | desert evening-primrose | Onagraceae
|
| OEPRC | Oenothera primiveris Gray ssp. caulescens (Munz) Munz | Oenothera primiveris ssp. primiveris | Onagraceae
|
| OEPRP | Oenothera primiveris Gray ssp. primiveris | desert evening-primrose | Onagraceae
|
| OEPRB2 | Oenothera primiveris Gray var. bufonis (M.E. Jones) Cronq. | Oenothera primiveris ssp. bufonis | Onagraceae
|
| OEPRC2 | Oenothera primiveris Gray var. caulescens Munz | Oenothera primiveris ssp. primiveris | Onagraceae
|
| OEPR | Oenothera primiveris Gray | desert evening-primrose | Onagraceae
|
| OEPR4 | Oenothera pringlei (Munz) Munz | Calylophus hartwegii ssp. maccartii | Onagraceae
|
| OEPR3 | Oenothera procera Woot. & Standl. | Oenothera villosa ssp. strigosa | Onagraceae
|
| OEPS2 | Oenothera psammophila (A. Nels. & J.F. Macbr.) W.L. Wagner, Stockhouse & Klein | St. Anthony Dunes evening-primrose | Onagraceae
|
| OEPT2 | Oenothera pterosperma S. Wats. | Camissonia pterosperma | Onagraceae
|
| OEPU2 | Oenothera pubens (S. Wats.) Munz | Camissonia pubens | Onagraceae
|
| OEPU | Oenothera pubescens Willd. ex Spreng. | South American evening-primrose | Onagraceae
|
| OEPY2 | Oenothera pycnocarpa Atkinson & Bartlett | Oenothera biennis | Onagraceae
|
| OEPY | Oenothera pygmaea Dougl. ex Lehm. | Camissonia pygmaea | Onagraceae
|
| OERE2 | Oenothera refracta S. Wats. | Camissonia refracta | Onagraceae
|
| OERH | Oenothera rhombipetala Nutt. ex Torr. & Gray | fourpoint evening-primrose | Onagraceae
|
| OERH2 | Oenothera rhombipetala auct. non Nutt. ex Torr. & Gray | Oenothera clelandii | Onagraceae
|
| OERO | Oenothera rosea L'H�r. ex Ait. | rose evening-primrose | Onagraceae
|
| OERU2 | Oenothera rubricapitata R.R. Gates | Oenothera parviflora | Onagraceae
|
| OERUB | Oenothera runcinata (Engelm.) Munz var. brevifolia (Engelm.) Munz | Oenothera pallida ssp. runcinata | Onagraceae
|
| OERUG | Oenothera runcinata (Engelm.) Munz var. gypsophila (Eastw.) Munz | Oenothera pallida ssp. gypsophila | Onagraceae
|