| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| OECAA5 | Oenothera caespitosa Nutt. ssp. australis Woot. & Standl. | Oenothera brachycarpa | Onagraceae
|
| OECAC2 | Oenothera caespitosa Nutt. ssp. caespitosa | tufted evening-primrose | Onagraceae
|
| OECAC3 | Oenothera caespitosa Nutt. ssp. crinita (Rydb.) Munz | tufted evening-primrose | Onagraceae
|
| OECAE4 | Oenothera caespitosa Nutt. ssp. eximia (Gray) Munz | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECAJ3 | Oenothera caespitosa Nutt. ssp. jonesii (Munz) Munz | Oenothera caespitosa ssp. crinita | Onagraceae
|
| OECAM3 | Oenothera caespitosa Nutt. ssp. macroglottis (Rydb.) W.L. Wagner | tufted evening-primrose | Onagraceae
|
| OECAM4 | Oenothera caespitosa Nutt. ssp. marginata (Nutt. ex Hook. & Arn.) Munz | tufted evening-primrose | Onagraceae
|
| OECAM8 | Oenothera caespitosa Nutt. ssp. montana (Nutt.) Munz | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECAN | Oenothera caespitosa Nutt. ssp. navajoensis W.L. Wagner, Stockhouse & Klein | Navajo evening-primrose | Onagraceae
|
| OECAP4 | Oenothera caespitosa Nutt. ssp. purpurea (S. Wats.) Munz | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECAA4 | Oenothera caespitosa Nutt. var. australis (Woot. & Standl.) Munz | Oenothera brachycarpa | Onagraceae
|
| OECAC4 | Oenothera caespitosa Nutt. var. crinita (Rydb.) Munz | Oenothera caespitosa ssp. crinita | Onagraceae
|
| OECAE3 | Oenothera caespitosa Nutt. var. eximia (Gray) Munz | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECAJ2 | Oenothera caespitosa Nutt. var. jonesii Munz | Oenothera caespitosa ssp. crinita | Onagraceae
|
| OECAL | Oenothera caespitosa Nutt. var. longiflora (Heller) Munz | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECAM5 | Oenothera caespitosa Nutt. var. macroglottis (Rydb.) Cronq. | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECAM7 | Oenothera caespitosa Nutt. var. marginata (Nutt. ex Hook. & Arn.) Munz | Oenothera caespitosa ssp. marginata | Onagraceae
|
| OECAM6 | Oenothera caespitosa Nutt. var. montana (Nutt.) Dur. | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECAN2 | Oenothera caespitosa Nutt. var. navajoensis (W.L. Wagner, Stockhouse & Klein) Cronq. | Oenothera caespitosa ssp. navajoensis | Onagraceae
|
| OECAP3 | Oenothera caespitosa Nutt. var. psammophila (A. Nels. & J.F. Macbr.) Munz | Oenothera psammophila | Onagraceae
|
| OECAP2 | Oenothera caespitosa Nutt. var. purpurea (S. Wats.) Munz | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECA10 | Oenothera caespitosa Nutt. | tufted evening-primrose | Onagraceae
|
| OECAA3 | Oenothera californica (S. Wats.) S. Wats. ssp. arizonica (Munz) W. Klein | California evening-primrose | Onagraceae
|
| OECAA2 | Oenothera californica (S. Wats.) S. Wats. ssp. avita W. Klein | California evening-primrose | Onagraceae
|
| OECAC | Oenothera californica (S. Wats.) S. Wats. ssp. californica | California evening-primrose | Onagraceae
|
| OECAE2 | Oenothera californica (S. Wats.) S. Wats. ssp. eurekensis (Munz & Roos) W. Klein | Eurela Dunes evening-primrose | Onagraceae
|
| OECAG | Oenothera californica (S. Wats.) S. Wats. var. glabrata Munz | Oenothera californica ssp. californica | Onagraceae
|
| OECA8 | Oenothera californica (Nutt. ex Torr. & Gray) Greene | Camissonia californica | Onagraceae
|
| OECA2 | Oenothera californica (S. Wats.) S. Wats. | California evening-primrose | Onagraceae
|
| OECAP | Oenothera campestris Greene ssp. parishii (Abrams) Munz | Camissonia campestris ssp. campestris | Onagraceae
|
| OECA7 | Oenothera campestris Greene | Camissonia campestris ssp. campestris | Onagraceae
|
| OECA3 | Oenothera canescens Torr. & Fr�m. | spotted evening-primrose | Onagraceae
|
| OECA6 | Oenothera canovirens Steele | Oenothera villosa ssp. villosa | Onagraceae
|
| OECAR | Oenothera cardiophylla Torr. ssp. robusta Raven | Camissonia cardiophylla ssp. robusta | Onagraceae
|
| OECAS | Oenothera cardiophylla Torr. var. splendens Munz & Johnston | Camissonia arenaria | Onagraceae
|
| OECAT | Oenothera cardiophylla Torr. var. typica Munz | Camissonia cardiophylla ssp. cardiophylla | Onagraceae
|
| OECA9 | Oenothera cardiophylla Torr. | Camissonia cardiophylla ssp. cardiophylla | Onagraceae
|
| OECA5 | Oenothera cavernae Munz | cavedwelling evening-primrose | Onagraceae
|
| OECEA | Oenothera cespitosa Nutt. ssp. australis Woot. & Standl. [orthographic variant] | Oenothera brachycarpa | Onagraceae
|
| OECEC2 | Oenothera cespitosa Nutt. ssp. cespitosa Nutt. [orthographic variant] | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECEC | Oenothera cespitosa Nutt. ssp. crinita (Rydb.) Munz [orthographic variant] | Oenothera caespitosa ssp. crinita | Onagraceae
|
| OECEE | Oenothera cespitosa Nutt. ssp. eximia (Gray) Munz [orthographic variant] | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECEJ2 | Oenothera cespitosa Nutt. ssp. jonesii (Munz) Munz [orthographic variant] | Oenothera caespitosa ssp. crinita | Onagraceae
|
| OECEM3 | Oenothera cespitosa Nutt. ssp. macroglottis (Rydb.) W.L. Wagner [orthographic variant] | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECEM4 | Oenothera cespitosa Nutt. ssp. marginata (Nutt. ex Hook. & Arn.) Munz [orthographic variant] | Oenothera caespitosa ssp. marginata | Onagraceae
|
| OECEM | Oenothera cespitosa Nutt. ssp. montana (Nutt.) Munz [orthographic variant] | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECEN | Oenothera cespitosa Nutt. ssp. navajoensis W.L. Wagner, Stockhouse & Klein [orthographic variant] | Oenothera caespitosa ssp. navajoensis | Onagraceae
|
| OECEP2 | Oenothera cespitosa Nutt. ssp. purpurea (S. Wats.) Munz [orthographic variant] | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECEA2 | Oenothera cespitosa Nutt. var. australis (Woot. & Standl.) Munz [orthographic variant] | Oenothera brachycarpa | Onagraceae
|
| OECEC3 | Oenothera cespitosa Nutt. var. crinita (Rydb.) Munz [orthographic variant] | Oenothera caespitosa ssp. crinita | Onagraceae
|
| OECEE2 | Oenothera cespitosa Nutt. var. eximia (Gray) Munz [orthographic variant] | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECEJ | Oenothera cespitosa Nutt. var. jonesii Munz [orthographic variant] | Oenothera caespitosa ssp. crinita | Onagraceae
|
| OECEL | Oenothera cespitosa Nutt. var. longiflora (Heller) Munz [orthographic variant] | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECEM6 | Oenothera cespitosa Nutt. var. macroglottis (Rydb.) Cronq. [orthographic variant] | Oenothera caespitosa ssp. macroglottis | Onagraceae
|
| OECEM2 | Oenothera cespitosa Nutt. var. marginata (Nutt. ex Hook. & Arn.) Munz [orthographic variant] | Oenothera caespitosa ssp. marginata | Onagraceae
|
| OECEM5 | Oenothera cespitosa Nutt. var. montana (Nutt.) Dur. [orthographic variant] | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECEN2 | Oenothera cespitosa Nutt. var. navajoensis (W.L. Wagner, Stockhouse & Klein) Cronq. [orthographic variant] | Oenothera caespitosa ssp. navajoensis | Onagraceae
|
| OECEP | Oenothera cespitosa Nutt. var. psammophila (A. Nels. & J.F. Macbr.) Munz [orthographic variant] | Oenothera psammophila | Onagraceae
|
| OECEP3 | Oenothera cespitosa Nutt. var. purpurea (S. Wats.) Munz [orthographic variant] | Oenothera caespitosa ssp. caespitosa | Onagraceae
|
| OECE2 | Oenothera cespitosa Nutt. [orthographic variant] | Oenothera caespitosa | Onagraceae
|
| OECH4 | Oenothera chamaenerioides Gray | Camissonia chamaenerioides | Onagraceae
|
| OECHS2 | Oenothera cheiranthifolia Hornem. ex Spreng. ssp. suffruticosa (S. Wats.) Munz | Camissonia cheiranthifolia ssp. suffruticosa | Onagraceae
|
| OECHN | Oenothera cheiranthifolia Hornem. ex Spreng. var. nitida (Greene) Munz | Camissonia cheiranthifolia ssp. cheiranthifolia | Onagraceae
|
| OECH5 | Oenothera cheiranthifolia Hornem. ex Spreng. | Camissonia cheiranthifolia ssp. cheiranthifolia | Onagraceae
|
| OECH3 | Oenothera cheradophila Bartlett | Oenothera villosa ssp. strigosa | Onagraceae
|
| OECLA | Oenothera claviformis Torr. & Fr�m. ssp. aurantiaca (Munz) Raven | Camissonia claviformis ssp. aurantiaca | Onagraceae
|
| OECLC | Oenothera claviformis Torr. & Fr�m. ssp. cruciformis (Kellogg) Raven | Camissonia claviformis ssp. cruciformis | Onagraceae
|
| OECLF | Oenothera claviformis Torr. & Fr�m. ssp. funerea Raven | Camissonia claviformis ssp. funerea | Onagraceae
|
| OECLI | Oenothera claviformis Torr. & Fr�m. ssp. integrior Raven | Camissonia claviformis ssp. integrior | Onagraceae
|
| OECLL | Oenothera claviformis Torr. & Fr�m. ssp. lancifolia (Heller) Raven | Camissonia claviformis ssp. lancifolia | Onagraceae
|
| OECLP5 | Oenothera claviformis Torr. & Fr�m. ssp. peeblesii (Munz) Raven | Camissonia claviformis ssp. peeblesii | Onagraceae
|
| OECLP2 | Oenothera claviformis Torr. & Fr�m. ssp. peirsonii (Munz) Raven | Camissonia claviformis ssp. peirsonii | Onagraceae
|
| OECLR | Oenothera claviformis Torr. & Fr�m. ssp. rubescens Raven | Camissonia claviformis ssp. rubescens | Onagraceae
|
| OECLY | Oenothera claviformis Torr. & Fr�m. ssp. yumae Raven | Camissonia claviformis ssp. yumae | Onagraceae
|
| OECLA2 | Oenothera claviformis Torr. & Fr�m. var. aurantiaca (Munz) Munz | Camissonia claviformis ssp. aurantiaca | Onagraceae
|
| OECLC3 | Oenothera claviformis Torr. & Fr�m. var. citrina Raven | Camissonia claviformis ssp. cruciformis | Onagraceae
|
| OECLC2 | Oenothera claviformis Torr. & Fr�m. var. cruciformis (Kellogg) Munz | Camissonia claviformis ssp. cruciformis | Onagraceae
|
| OECLP4 | Oenothera claviformis Torr. & Fr�m. var. peeblesii Munz | Camissonia claviformis ssp. peeblesii | Onagraceae
|
| OECLP3 | Oenothera claviformis Torr. & Fr�m. var. peirsonii Munz | Camissonia claviformis ssp. peirsonii | Onagraceae
|
| OECLP | Oenothera claviformis Torr. & Fr�m. var. purpurascens (S. Wats.) Munz | Camissonia claviformis ssp. integrior | Onagraceae
|
| OECL2 | Oenothera claviformis Torr. & Fr�m. | Camissonia claviformis ssp. claviformis | Onagraceae
|
| OECL3 | Oenothera clelandii W. Dietr., Raven & W.L. Wagner | Cleland's evening-primrose | Onagraceae
|
| OECO4 | Oenothera confertiflora Raven | Camissonia confertiflora | Onagraceae
|
| OECOE | Oenothera contorta Dougl. ex Lehm. var. epilobioides (Greene) Munz | Camissonia strigulosa | Onagraceae
|
| OECOF2 | Oenothera contorta Dougl. ex Lehm. var. flexuosa (A. Nels.) Munz | Camissonia pusilla | Onagraceae
|
| OECOH | Oenothera contorta Dougl. ex Lehm. var. hilgardii (Greene) Munz | Camissonia hilgardii | Onagraceae
|
| OECOP | Oenothera contorta Dougl. ex Lehm. var. pubens (S. Wats.) Coville | Camissonia pubens | Onagraceae
|
| OECOS | Oenothera contorta Dougl. ex Lehm. var. strigulosa (Fisch. & C.A. Mey.) Munz | Camissonia strigulosa | Onagraceae
|
| OECO5 | Oenothera contorta Dougl. ex Lehm. | Camissonia contorta | Onagraceae
|
| OECO6 | Oenothera cordata J.W. Loudon | heartleaf evening-primrose | Onagraceae
|
| OECO2 | Oenothera coronopifolia Torr. & Gray | crownleaf evening-primrose | Onagraceae
|
| OECO3 | Oenothera coryi W.L. Wagner | El Paso evening-primrose | Onagraceae
|
| OECRS2 | Oenothera cruciata Nutt. ex G. Don var. sabulonensis Fern. | Oenothera parviflora | Onagraceae
|
| OECRS | Oenothera cruciata Nutt. ex G. Don var. stenopetala (Bickn.) Fern. | Oenothera oakesiana | Onagraceae
|
| OECR2 | Oenothera cruciata (S. Wats.) Munz | Camissonia contorta | Onagraceae
|
| OECR3 | Oenothera cruciata Nutt. ex G. Don | Oenothera parviflora | Onagraceae
|
| OECR | Oenothera cruciformis Kellogg | Camissonia claviformis ssp. cruciformis | Onagraceae
|
| OECT | Oenothera ctenophylla (Woot. & Standl.) Tidestrom | Oenothera albicaulis | Onagraceae
|
| OECU | Oenothera curtissii Small | Curtiss' evening-primrose | Onagraceae
|
| OECY | Oenothera cymatilis Bartlett | Oenothera parviflora | Onagraceae
|
| OEDEC6 | Oenothera decorticans (Hook. & Arn.) Greene var. condensata Munz | Camissonia boothii ssp. condensata | Onagraceae
|