Oenothera stricta |
Oenothera spachiana |
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Chilean evening primrose |
spach's evening primrose |
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Habit | Herbs annual, densely strigillose; from a sparsely branched taproot. | |
Stems | erect, usually unbranched or with few ascending branches, 10–30(–45) cm. |
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Leaves | in a basal rosette and cauline, basal 2–5 × 0.5–1.5 cm, petiole 0.5–2 cm, blade oblanceolate to elliptic, margins subentire; cauline 3–6 × 0.2–0.6 cm, petiole 0.2–0.6(–1.5) cm, blade narrowly lanceolate to linear, margins subentire. |
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Inflorescences | erect, flowers in leaf axils in distal 1/2 of plant. |
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Flowers | opening near sunrise; buds with free tips to 1 mm, erect to spreading; floral tube 4–10 mm; sepals 4–8 mm; petals pale yellow, fading pale pink, 5–14 mm; filaments 3–7 mm, anthers 2–4 mm, pollen 85–100% fertile; style 3–7 mm, stigma surrounded by anthers. |
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Capsules | broadly clavate, 4-angled, 5–15 × 3–5 mm, stipe 2–5 mm; sessile. |
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Seeds | 1 × 0.5 mm. |
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2n | = 14. |
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Oenothera stricta |
Oenothera spachiana |
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Phenology | Flowering Mar–May. | |
Habitat | Prairies, open roadsides, sandy places. | |
Elevation | 10–200 m. (0–700 ft.) | |
Distribution |
South America [Introduced, California] |
AL; AR; LA; MS; OK; TX |
Discussion | Subspecies 2 (1 in the flora). Oenothera stricta is a PTH species and forms a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous (W. Dietrich 1977). Subspecies stricta is naturalized in many areas around the world and may be so in California. Subspecies altissima W. Dietrich occurs only in Argentina. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
G. B. Straley (1977) determined Oenothera spachiana to be self-compatible and autogamous. Collections outside the native range of O. spachiana have been made as a ballast weed in Camden County, New Jersey. Oenothera drummondii (Spach) Walpers (1843), not Hooker (1834) is a later homonym and pertains 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. Oenothera > subsect. Munzia > ser. Allochroa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Kneiffia |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Blennoderma drummondii, Kneiffia spachiana, O. uncinata | |
Name authority | Ledebour ex Link: Enum. Hort. Berol. Alt. 1: 377. (1821) — (as striata) | Torrey & A. Gray: Fl. N. Amer. 1: 498. (1840) |
Web links |