Oenothera stricta |
Oenothera clelandii |
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Chilean evening primrose |
Cleland's evening primrose |
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Habit | Herbs biennial, densely to sometimes sparsely strigillose, or also sparsely glandular puberulent distally. | |
Stems | sometimes with lateral branches arising obliquely from rosette, 20–70(–100) cm. |
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Leaves | 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. |
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Inflorescences | dense, without lateral branches, mature buds usually not overtopping spike apex. |
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Flowers | 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. |
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Capsules | narrowly lanceoloid, 10–20 ×2–3 mm. |
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Seeds | brown, sometimes flecked with dark red spots, ellipsoid, 1–1.9 × 0.4–0.8 mm. |
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2n | = 14. |
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Oenothera stricta |
Oenothera clelandii |
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Phenology | Flowering Jun–Aug(–Sep). | |
Habitat | Fields, prairies, sandy soil. | |
Elevation | 150–300 m. [500–1000 ft.] | |
Distribution |
South America [Introduced, California] |
AR; IA; IL; IN; KY; MI; MN; MO; NJ; NY; VA; WI; ON
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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.) |
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 | ||
Sibling taxa | ||
Subordinate taxa | ||
Name authority | Ledebour ex Link: Enum. Hort. Berol. Alt. 1: 377. (1821) — (as striata) | W. Dietrich, P. H. Raven & W. L. Wagner: Ann. Missouri Bot. Gard. 70: 196. (1983) |
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