Oenothera rosea |
Oenothera grandis |
|
---|---|---|
pink evening primrose, rose evening-primrose |
largeflower eveningprimrose, showy evening-primrose |
|
Habit | Herbs perennial, caulescent, strigillose and often also sparsely hirsute; from slender taproot. | Herbs annual, strigillose and sparsely villous, also glandular puberulent distally. |
Stems | 1–several, ascending to decumbent, 7–65 cm. |
erect to ascending, often with ascending lateral branches, 15–60(–100) cm. |
Leaves | in a basal rosette and cauline, basal 1–6 × 0.3–2 cm, blade narrowly elliptic to elliptic or ovate, margins subentire, weakly serrulate, or sinuate-pinnatifid; cauline 1–6 × 0.3–2 cm, blade narrowly elliptic to narrowly ovate, margins subentire or weakly serrulate, proximal ones sinuate-pinnatifid. |
in a basal rosette and cauline, basal 5–13 × 1–3 cm, cauline 3–10 × 1.5–3.5 cm; blade green, narrowly oblanceolate to narrowly elliptic, margins lobed or dentate, lobes often dentate; bracts spreading, flat. |
Inflorescences | erect. |
|
Flowers | 1–3 opening per day near sunrise; buds with free tips 0.1–1 mm; floral tube 4–8 mm; sepals 6–12 mm; petals rose purple, fading darker, 4–12 mm; filaments 4–6 mm, anthers 2–3.5 mm, pollen 35–65% fertile; style 7–13.5 mm, stigma surrounded by anthers at anthesis. |
1–few opening per day near sunset; buds erect, with free tips terminal, erect or hornlike, 1.5–5 mm; floral tube 25–45 mm; sepals 15–30 mm; petals yellow, very broadly obovate or shallowly obcordate, 25–40 mm; filaments 12–22 mm, anthers 4–11 mm, pollen 85–100% fertile; style 40–75 mm, stigma exserted beyond anthers at anthesis. |
Capsules | narrowly obovoid, 4–12 × 2–4 mm, apex attenuate to a sterile beak, proximal stipe 5–20 mm, gradually tapering to base, valve midrib prominent in distal part; sessile. |
cylindrical, sometimes slightly enlarged toward apex, 25–50 ×2–3 mm. |
Seeds | narrowly obovoid, 0.5–0.9 × 0.3–0.5 mm. |
broadly ellipsoid to subglobose, 0.8–1.5 × 0.5–0.9 mm. |
2n | = 14. |
= 14. |
Oenothera rosea |
Oenothera grandis |
|
Phenology | Flowering Mar–Sep. | Flowering Mar–Sep. |
Habitat | tropical areas.. | Open, sandy sites. |
Elevation | 10–600 m. (0–2000 ft.) | 0–1500(–2200) m. (0–4900(–7200) ft.) |
Distribution |
AZ; CA; TX; Mexico; Central America; West Indies; tropical areas [Introduced in South America (Argentina), Europe, Asia, s Africa, Atlantic Islands (Azores, Canary Islands)]
|
AL; AR; CO; CT; FL; IL; IN; KS; LA; MD; MI; MO; NC; NE; NJ; NM; TX; Mexico (Tamaulipas)
|
Discussion | Oenothera rosea is a PTH species, forming a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous. In the flora area, it is known from Cochise, Pima, and Santa Cruz counties in Arizona, Alameda, Los Angeles, Riverside, San Bernardino, San Diego, San Francisco, and Santa Barbara counties in California (primarily in urban areas), and from southern Texas. It is clearly of North American origin, since all of its close relatives are confined to North America, and has spread south along the Andes. It occurs at 500–3700 m in South America but generally at lower elevations in most areas. The name Hartmannia affinis Spach is illegitimate, being based on Oenothera virgata; H. gauroides Spach is also illegitimate, being based on O. rosea; O. purpurea Lamarck is a later homonym; these three names pertain here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera grandis is probably native to eastern New Mexico and Colorado, Arkansas, Kansas, Louisiana, Missouri, Nebraska, Oklahoma, and Texas, and northeastern Tamaulipas, Mexico. Scattered collections made in other states probably represent introductions (W. Dietrich and W. L. Wagner 1988). Oenothera grandis is self-incompatible (W. Dietrich and W. L. Wagner 1988). Oenothera laciniata Hill var. occidentalis Small and O. laciniata var. grandis Britton are illegitimate superfluous names based on O. sinuata Linnaeus var. grandiflora S. Watson and pertain here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 10. | FNA vol. 10. |
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Hartmannia | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Raimannia |
Sibling taxa | ||
Synonyms | Gaura epilobia, Godetia heuckii, Hartmannia rosea, H. rosea var. parvifolia, H. virgata, O. psycrophila, O. rosea var. parvifolia, O. rubra, O. virgata, Xylopleurum roseum | O. laciniata var. grandiflora, O. sinuata var. grandiflora, Raimannia grandis |
Name authority | L’Héritier ex Aiton: Hort. Kew. 2: 3. (1789) | Smyth: Trans. Kansas Acad. Sci. 16: 160. (1899) |
Web links |