Oenothera stricta |
Oenothera harringtonii |
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Chilean evening primrose |
Colorado Springs evening primrose |
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Habit | Herbs robust spring annual or, rarely, surviving a second year, caulescent, hirtellous, also glandular puberulent; from stout taproot. | |
Stems | ascending to erect, stout, unbranched or with lateral stems from basal rosette, densely leafy, 15–30 cm. |
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Leaves | 10–14(–14.5) × 1.5–2.3(–3) cm; petiole 4.3–6.6 cm; blade narrowly oblanceolate, margins irregularly and coarsely dentate, apex acute. |
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Flowers | usually 5–10 per stem opening per day near sunset, with heavy, sweet scent; buds erect; floral tube 31–60 mm; sepals 17–26 mm; petals white, fading pale pink, 20–26 mm; filaments 11–16 mm, anthers 8–11 mm; style 65–96 mm, stigma exserted beyond anthers at anthesis. |
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Capsules | straight, lanceoloid, obtusely 4-angled, (21–)25–30(–35) × (5–)6–8 mm, tapering to a sterile beak 6–8 mm, dehiscent 1/2–2/3 their length, valve margins with 5–8 conspicuous, irregular tubercles, sometimes 2 or more coalesced into a sinuate ridge, also with conspicuous medial ridge throughout; pedicel 0.5–1 mm. |
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Seeds | numerous, usually in 2 distinct rows per locule, sometimes rows partially overlapping, narrowly obovoid, 2.1–2.3 × 1–1.3 mm, embryo slightly less than 1/2 seed volume, surface appearing finely striate but papillose under magnification; seed collar with membrane intact at maturity, membrane rarely splitting and separating from collar, margin entire. |
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2n | = 14. |
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Oenothera stricta |
Oenothera harringtonii |
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Phenology | Flowering May–Jun. | |
Habitat | On compacted, silty clay to looser rocky and sandy soil in open grassland. | |
Elevation | 1400–1900 m. (4600–6200 ft.) | |
Distribution |
South America [Introduced, California] |
CO |
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 harringtonii is known only from southeastern Colorado from western El Paso and eastern Fremont counties, southeast through Pueblo to Otero counties, and south to Las Animas County; it may also occur in adjacent Colfax and Union counties in New Mexico but has not been collected there. Oenothera harringtonii is self-incompatible (W. L. Wagner et al. 1985; Wagner 2005). (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. Pachylophus |
Sibling taxa | ||
Subordinate taxa | ||
Name authority | Ledebour ex Link: Enum. Hort. Berol. Alt. 1: 377. (1821) — (as striata) | W. L. Wagner, Stockhouse & W. M. Klein: Ann. Missouri Bot. Gard. 70: 195. (1983) |
Web links |