Oenothera coronopifolia |
Oenothera capillifolia |
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crownleaf evening primrose |
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Habit | Herbs perennial, strigillose, usually also hirsute; from a taproot, lateral roots producing adventitious shoots. | Herbs perennial (short-lived or, sometimes, suffrutescent) or annual, glabrous or strigillose; from a stout taproot. | ||||
Stems | ascending to erect, 1–several from base, these unbranched to well-branched, 10–60 cm. |
1–many, weakly decumbent to ascending or erect, unbranched to moderately branched, (10–)25–80 cm. |
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Leaves | in a weakly developed basal rosette and cauline, 2–7 × 0.2–1.5 cm, axillary fascicles of reduced leaves often present; blade oblanceolate to oblong, margins usually pinnatifid, sometimes proximal ones coarsely few-toothed. |
1–9 × (0.1–)0.3–1 cm, sometimes fascicles of small leaves to 2 cm present in non-flowering axils; petiole 0–0.6 cm; blade linear to narrowly lanceolate or oblanceolate, often folded lengthwise, usually not much reduced distally, proximalmost leaves sometimes spatulate, base attenuate, margins subentire or serrulate or spinulose-serrate, apex acute. |
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Flowers | 1–3 opening per day near sunset; buds nodding, weakly quadrangular, without free tips; floral tube 10–25 mm, mouth conspicuously pubescent, closed with straight, white hairs, 1–2 mm; sepals 10–20 mm; petals white, fading pink, ovate or shallowly obcordate, 10–15(–20) mm; filaments 10–15 mm, anthers 4–7 mm; style 17–42 mm, stigma exserted beyond anthers at anthesis. |
opening at sunrise; buds with free tips 0–4 mm; floral tube 5–20 mm; sepals 4–12 mm, midribs keeled; petals yellow, fading orangish to purplish, 6–25 mm; antisepalous filaments 2–8 mm, antipetalous filaments 1–4 mm, anthers 2–7 mm, pollen 90–100% fertile; style 9–30 mm, stigma sometimes blue-black, discoid to quadrangular, exserted beyond anthers. |
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Capsules | ascending to erect, straight, fusiform, weakly 4-angled, 10–20 × 3–5 mm, dehiscent 1/2 their length; sessile. |
10–35 × 1–2 mm, hard, dehiscent 1/2 their length, often tardily dehiscent throughout their length. |
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Seeds | in 2 rows per locule, ellipsoid to subglobose, 1.5–2 × 1.2–1.5 mm, surface regularly pitted, pits in longitudinal lines. |
obovoid, 1–1.8 mm, sharply angled, apex truncate. |
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2n | = 14, 28. |
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Oenothera coronopifolia |
Oenothera capillifolia |
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Phenology | Flowering (Mar–)Jun–Aug(–Sep). | |||||
Habitat | Dry, open sites, grassy meadows, slopes, along drainages, foothills and mountains. | |||||
Elevation | 1500–3000 m. (4900–9800 ft.) | |||||
Distribution |
AZ; CO; ID; NE; NM; SD; UT; WY
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c United States; sc United States; n Mexico |
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Discussion | Oenothera coronopifolia apparently has both self-incompatible and self-compatible populations (P. H. Raven 1979; W. L. Wagner et al. 2007; K. E. Theiss et al. 2010). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 2 (2 in the flora). Oenothera capillifolia is self-incompatible (H. F. Towner 1977). Oenothera berlandieri (Spach) Steudel 1841, not D. Dietrich 1840, is superfluous and cannot be used in Oenothera when transferred from Calylophus, and pertains here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 10. | FNA vol. 10. | ||||
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Kleinia | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Calylophus > subsect. Calylophus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Anogra coronopifolia | Meriolix capillifolia | ||||
Name authority | Torrey & A. Gray: Fl. N. Amer. 1: 495. (1840) | Scheele: Linnaea 21: 576. (1848) | ||||
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