Oenothera stricta |
Oenothera tetraptera |
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Chilean evening primrose |
fourwing evening-primrose |
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Habit | Herbs annual or perennial, strigillose and also hirsute; from a slender taproot. | |
Stems | 15–50 cm. |
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Leaves | 2.5–10 × 0.6–2.5 cm; petiole 0.2–2.2 cm; blade usually lanceolate to oblanceolate, sometimes elliptic, margins weakly serrate to sinuate-pinnatifid. |
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Flowers | 1–3 opening per day near sunset; buds with free tips 0.5–3 mm; floral tube 10–30 mm; sepals 20–40 mm; petals white, fading pink, 20–43 mm; filaments 12–18 mm, anthers 5–10 mm, pollen 85–100% fertile; style 19–67 mm, stigma exserted beyond anthers at anthesis. |
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Capsules | broadly clavate or obovoid, 20–51 × 5–7 mm, winged, wings 2–4 mm, valve surface with prominent midrib, proximal stipe 8–45 mm; sessile. |
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Seeds | narrowly obovoid, 1–1.5 × 0.5–0.7 mm. |
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2n | = 14. |
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Oenothera stricta |
Oenothera tetraptera |
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Phenology | Flowering Feb–May. | |
Habitat | Alluvial flats, open areas, sandy soil, weedy sites. | |
Elevation | 10–300[–2000] m. (0–1000[–6600] ft.) | |
Distribution |
South America [Introduced, California] |
TX; Mexico; Central America; West Indies (Jamaica); n South America [Introduced widely in temperate Europe, Asia, s Africa, Australia]
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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.) |
In the flora area, Oenothera tetraptera is known only from southern Texas. Oenothera tetraptera presumably has become naturalized in South America (Argentina, Bolivia, Colombia, Ecuador, Venezuela), West Indies (Jamaica), Europe, Asia, South Africa, and Australia. Oenothera candida Dumont Courset is a superfluous name, as is O. candida Bellardi ex Colla, and they both pertain here. The name Hartmannia macrantha Spach is illegitimate 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. Leucocoryne |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Hartmannia latiflora, H. tetraptera, O. latiflora, O. tetraptera var. immutabilis, Xylopleurum tetrapterum | |
Name authority | Ledebour ex Link: Enum. Hort. Berol. Alt. 1: 377. (1821) — (as striata) | Cavanilles: Icon. 3: 40, plate 279. (1796) |
Web links |