Oenothera capillifolia |
Oenothera cinerea |
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high-plains beeblossom, woolly beeblossom |
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Habit | Herbs perennial (short-lived or, sometimes, suffrutescent) or annual, glabrous or strigillose; from a stout taproot. | Herbs suffrutescent, densely soft-villous, hairs mostly appressed, 2–3 mm, becoming less villous distally, also strigillose, rarely glandular puberulent or hispidulous, plant parts grayish green; from deep, twisted, woody rootstock. | ||||||||
Stems | 1–many, weakly decumbent to ascending or erect, unbranched to moderately branched, (10–)25–80 cm. |
erect, several-branched near ground, also branched proximal to inflorescences, 60–280 cm. |
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Leaves | 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. |
in a basal rosette and cauline, 0.5–8 × 0.15–2 cm, sessile, blade narrowly lanceolate or oblanceolate to very narrowly elliptic or linear, margins usually subentire or shallowly sinuate-dentate, sometimes deeply sinuate-dentate, often undulate. |
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Inflorescences | slender. |
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Flowers | 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. |
4-merous, zygomorphic, opening near sunset; floral tube 1.5–5 mm; sepals 6–14 mm; petals white, fading pink to red, slightly unequal, elliptic, 7–13 mm, clawed; stamens presented in lower 1/2 of flower, filaments 4.5–11 mm, anthers 2–4.5 mm, pollen 90–100% fertile; style 9–19 mm, stigma exserted beyond anthers at anthesis. |
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Capsules | 10–35 × 1–2 mm, hard, dehiscent 1/2 their length, often tardily dehiscent throughout their length. |
lanceoloid to narrowly ovoid, 4-winged, 9–19 × 1–3.5 mm, abruptly constricted to a long, sterile stipe 2–10 mm. |
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Seeds | obovoid, 1–1.8 mm, sharply angled, apex truncate. |
(1 or)2–4, 2–3(–4) × 0.8–1.3 mm, yellowish to light brown or rarely reddish brown. |
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Oenothera capillifolia |
Oenothera cinerea |
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Distribution | c United States; sc United States; n Mexico |
sc United States
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Discussion | 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.) |
Subspecies 2 (2 in the flora). P. H. Raven and D. P. Gregory (1972[1973]) determined Oenothera cinerea to be self-incompatible. The two subspecies recognized here have disjunct distributions but are very similar morphologically. (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. Calylophus > subsect. Calylophus | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Gaura > subsect. Stipogaura | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Meriolix capillifolia | Gaura cinerea | ||||||||
Name authority | Scheele: Linnaea 21: 576. (1848) | (Wooton & Standley) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 211. (2007) | ||||||||
Web links |