Herbs biennial or winter-annual, usually predominately and densely strigillose, sometimes also villous with scattered, appressed hairs, rarely with a few pustulate hairs, inflorescence sometimes also glandular puberulent. Stems erect, usually green, rarely flushed with red, unbranched or with branches arising obliquely from rosette and secondary branches arising from main-stem, 60–180 cm. Leaves in a basal rosette and cauline, basal 10–30 × 2.5–5 cm, cauline 4–20 × 1–5 cm; blade dull green, flat, narrowly oblanceolate, oblanceolate to narrowly elliptic, or narrowly lance­olate, margins bluntly dentate or subentire, teeth widely spaced; bracts persistent. Inflorescences erect, usually unbranched, rarely with few lateral branches. Flowers opening near sunset; buds erect, 7–12 mm diam., with free tips terminal, erect, 0.5–3 mm; floral-tube persist­ent on ovary after anthesis, (60–) 80–120 (–160) mm; sepals yellowish green, red-striped to red throughout, 30–55 mm; petals yellow, fading orange or pale-yellow, very broadly obcordate, 40–50 mm; filaments 23–30 mm, anthers 12–22 mm, pollen 90–100% fertile; style 90–170 (–200) mm, stigma exserted beyond anthers at anthesis. Capsules erect or slightly spreading, dull green or gray-green when dry, narrowly lanceoloid, 20–50 × 6–12 mm, free tips of valves 2.5–5 mm. Seeds 1–1.2 × 0.7–1.3 mm. 2n = 14.

Phenology: Flowering Jul–Sep(–Oct).
Habitat: Sandy stream banks, ditches, moist areas, cultivated areas, disturbed roadsides.
Elevation: (30–)300–1800 m.

Distribution

• Generated Map
• Legacy Map

Kans., Okla., Tex., Mexico (Coahuila), Mexico (Nuevo León), Mexico (Puebla), in e Asia (Japan), s Africa, Atlantic Islands (Canary Islands)

Discussion

Oenothera jamesii has plastome I and a AA genome composition; it is known in the flora area from southern Kansas (Clark County), central Oklahoma, and Texas.

Selected References

None.

Lower Taxa

None.