Subdivisions of the genus Oenothera in the Onagraceae (evening primrose) family:
Section Anogra
Oenothera sect. Angora â western North America in dry, sandy soils in deserts, grasslands, and forest openings, up to 2000 m. elevation.
- Oenothera arizonica â California evening primrose (Arizona & Mexico)
- Oenothera avita â California evening primrose
- O. avita ssp. avita
- O. avita ssp. californica
- O. avita ssp. eurekensis â Eureka Dunes evening primrose
- Oenothera deltoides â birdcage evening primrose
- O. deltoides ssp. ambigua
- O. deltoides ssp. cognata
- O. deltoides ssp. deltoides
- O. deltoides ssp. howellii ( - Antioch Dunes evening primrose
- O. deltoides ssp. piperi
- Oenothera engelmannii â Engelmann's evening primrose (south-central U.S.)
- Oenothera neomexicana â New Mexico evening primrose (Arizona, New Mexico)
- Oenothera nuttallii â Nuttall's evening primrose (central North America)
- Oenothera pallida â pale evening primrose, white buttercup (western North America)
- O. pallida ssp. gypsophila â whitepole evening primrose
- O. pallida ssp. pallida
- O. pallida ssp. runcinata
- O. pallida ssp. trichocalyx
- Oenothera wigginsii â (Baja California in Mexico)
Section Calylophus
Oenothera sect. Calylophus â in North American Great Plains and south to central Mexico.
subsect. Calylophus
subsect. Salpingia
Section Contortae
Oenothera sect. Contortae â Sierra Nevadas of California, extending just into western Nevada.
Section Eremia
Oenothera sect. Eremia â western North America, with a distribution in the Chihuahuan, Mojave, and Sonoran deserts.
- Oenothera primiveris â desert evening primrose
- O. primiveris ssp. bufonis â large yellow desert primrose
- O. primiveris ssp. primiveris
Section Gaura
Oenothera sect. Gaura â beeblossom (includes most of the taxa formerly placed in genus Gaura)
subsect. Campogaura
subsect. Gaura
subsect. Gauridium
subsect. Schizocarya
subsect. Stenosiphon
subsect. Stipogaura
subsect. Xenogaura
subsect. Xerogaura
Section Gauropsis
Oenothera sect. Gauropsis â Wyoming, western Nebraska, eastern Colorado, New Mexico, Kansas and the Texas Panhandle in the U.S. High Plains.
Section Hartmannia
Oenothera sect. Hartmannia â Generally in Mexico, Arizona, and Texas. But O. speciosa extends into the U.S. Central Plains, and O. rosea extends to the Caribbean, and northern South America.
Section Kleinia
Oenothera sect. Kleinia â distributed over the Chihuahuan, Sonoran, and southern portions of the Great Basin deserts to the Great Plains, from southern Utah to southeastern Montana and western North Dakota, and northern Mexico.
Section Kneiffia
Oenothera sect. Kneiffia â eastern North America, at elevations up to 1900 m.
- Oenothera fruticosa â narrow-leaved or southern sundrops (eastern North America)
- O. fruticosa ssp. fruticosa â (more southern distribution)
- O. fruticosa ssp. glauca â (more northern distribution)
- Oenothera perennis â little evening primrose, perennial sundrops (North America)
- Oenothera pilosella â prairie sundrops, meadow evening primrose
- O. pilosella ssp. pilosella â (eastern North America)
- O. pilosella ssp. sessilis â ()
- Oenothera riparia â riverbank sundrops
- Oenothera spachiana â Spach's evening-primrose ()
Section Lavauxia
Oenothera sect. Lavauxia â North and South America.
subsect. Australis
subsect. Lavauxia
- Oenothera acutissima â Flaming Gorge evening primrose (Utah, Colorado)
- Oenothera flava â yellow evening primrose (west & central North America)
- O. flava ssp. flava
- O. flava ssp. taraxacoides
- Oenothera triloba â stemless evening primrose (North America)
Section Leucocoryne
Oenothera sect. Leucocoryne â from southern Texas, through northern Mexico to the Trans-Volcanic Belt of central Mexico, southward to Guatemala, Nicaragua, and Costa Rica.
Section Megapterium
Oenothera sect. Megapterium â distributed in south-central North America.
- Oenothera brachycarpa â short-fruit evening primrose ()
- Oenothera howardii â Howard's evening primrose ()
- Oenothera macrocarpa â Missouri or big-fruit evening primrose
- O. macrocarpa ssp. fremontii â Fremont's evening primrose ()
- O. macrocarpa ssp. incana â big-fruit evening primrose ()
- O. macrocarpa ssp. macrocarpa â big-fruit evening primrose ()
- O. macrocarpa ssp. mexicana â (Mexico)
- O. macrocarpa ssp. oklahomensis â Oklahoma evening primrose ()
Section Oenothera
Oenothera sect. Oenothera â distributed from Canada to Panama.
subsect. Candela
subsect. Emersonia
subsect. Munzia
series Allochroa
series Clelandia
series Renneria
subsect. Nutantigemma
subsect. Oenothera
subsect. Raimannia
Section Pachylophus
Oenothera sect. Pachylophus â western North America.
Section Paradoxus
Oenothera sect. Paradoxus â distribution within the Chihuahuan Desert.
Section Peniophyllum
Oenothera sect. Peniophyllum â The single species is found in the southeastern U.S.
Section Ravenia
Oenothera sect. Ravenia â within Mexico.
Section Xanthocoryne
Oenothera sect. Xanthocoryne â from central Mexico to northern South America.
References