Oenothera rosea |
Oenothera clelandii |
|
---|---|---|
pink evening primrose, rose evening-primrose |
Cleland's evening primrose |
|
Habit | Herbs perennial, caulescent, strigillose and often also sparsely hirsute; from slender taproot. | Herbs biennial, densely to sometimes sparsely strigillose, or also sparsely glandular puberulent distally. |
Stems | 1–several, ascending to decumbent, 7–65 cm. |
sometimes with lateral branches arising obliquely from rosette, 20–70(–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 5–16 × 0.5–1.5 cm, cauline 2–12 × 0.5–2 cm; blade narrowly oblanceolate, gradually narrowly elliptic to narrowly lanceolate distally, margins lobed to remotely dentate or subentire; bracts slightly longer than capsule they subtend. |
Inflorescences | erect. |
dense, without lateral branches, mature buds usually not overtopping spike apex. |
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. |
2–several per spike opening per day near sunset; buds erect, with free tips erect, 0.5–2 mm; floral tube slightly curved upward to± straight, 15–40 mm; sepals 6–13 mm; petals yellow, broadly elliptic to rhombic-ovate, 5–16 mm; filaments 4–18 mm, anthers 2–3.5 mm, pollen ca. 50% fertile; style 20–40 mm, stigma surrounded by 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. |
narrowly lanceoloid, 10–20 ×2–3 mm. |
Seeds | narrowly obovoid, 0.5–0.9 × 0.3–0.5 mm. |
brown, sometimes flecked with dark red spots, ellipsoid, 1–1.9 × 0.4–0.8 mm. |
2n | = 14. |
= 14. |
Oenothera rosea |
Oenothera clelandii |
|
Phenology | Flowering Mar–Sep. | Flowering Jun–Aug(–Sep). |
Habitat | tropical areas.. | Fields, prairies, sandy soil. |
Elevation | 10–600 m. (0–2000 ft.) | 150–300 m. (500–1000 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)]
|
AR; IA; IL; IN; KY; MI; MN; MO; NJ; NY; VA; WI; ON
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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 clelandii is a PTH species and forms a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous (W. Dietrich and W. L. Wagner 1988). Some localities in the easternmost states may represent introductions, primarily occurring in disturbed areas along roads and railroad lines. (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. Candela |
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 | |
Name authority | L’Héritier ex Aiton: Hort. Kew. 2: 3. (1789) | W. Dietrich, P. H. Raven & W. L. Wagner: Ann. Missouri Bot. Gard. 70: 196. (1983) |
Web links |