Oenothera capillifolia |
Oenothera capillifolia subsp. capillifolia |
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Habit | Herbs perennial (short-lived or, sometimes, suffrutescent) or annual, glabrous or strigillose; from a stout taproot. | Herbs annual or short-lived perennial.Stems 1–several, unbranched or sparsely branched, ascending to erect, 30–80 cm. | ||||
Stems | 1–many, weakly decumbent to ascending or erect, unbranched to moderately branched, (10–)25–80 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. |
2.5–9 × 0.2–1 cm; blade margins remotely serrulate to spinulose-serrate. |
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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. |
buds with free tips 0.5–4 mm; sepals with conspicuously keeled midribs. |
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Capsules | 10–35 × 1–2 mm, hard, dehiscent 1/2 their length, often tardily dehiscent throughout their length. |
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Seeds | obovoid, 1–1.8 mm, sharply angled, apex truncate. |
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2n | = 14. |
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Oenothera capillifolia |
Oenothera capillifolia subsp. capillifolia |
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Phenology | Flowering Mar–Sep. | |||||
Habitat | Prairies, open places in oak savannas on rocky, clay, or sandy soil, often calcareous. | |||||
Elevation | 0–900 m. (0–3000 ft.) | |||||
Distribution | c United States; sc United States; n Mexico |
LA; OK; TX |
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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 capillifolia occurs from Blaine and Lincoln counties, Oklahoma, south through a narrow portion of north-central Texas to central Texas, where it is widely distributed, especially on the Edwards Plateau; also occurring locally in western and southern Louisiana. The floral tubes and/or stigma of some populations, especially from Bexar, Blanco, Comal, Gillespie, Hays, Kendall, Kerr, and Travis counties, Texas, are a deep blackish purple, while others are yellow, which is typical of the section. (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. Calylophus > subsect. Calylophus > Oenothera capillifolia | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Meriolix capillifolia | Calylophus berlandieri subsp. pinifolius, Meriolix hillii, M. melanoglottis, M. serrulata var. pinifolia, O. berlandieri subsp. pinifolia, O. serrulata var. maculatah., O. serrulata subsp. pinifolia, O. serrulata var. pinifolia | ||||
Name authority | Scheele: Linnaea 21: 576. (1848) | unknown | ||||
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