Oenothera coronopifolia |
Oenothera glaucifolia |
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crownleaf evening primrose |
false gaura |
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Habit | Herbs perennial, strigillose, usually also hirsute; from a taproot, lateral roots producing adventitious shoots. | Herbs probably biennial, glabrous, becoming sparsely to densely glandular puberulent and short-villous distally, glaucous at least in proximal parts; from stout roots. |
Stems | ascending to erect, 1–several from base, these unbranched to well-branched, 10–60 cm. |
erect, branched or unbranched, 30–300 cm. |
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. |
in a basal rosette and cauline, basal 3–7 × 0.5–2 cm, sessile, blade oblong to oblong-lanceolate, base usually ± auriculate, margins entire; cauline 3–8(–10) × 0.4–1.8 cm, blade lanceolate to oblong-lanceolate, gradually smaller, becoming linear-subulate distally. |
Inflorescences | long, wandlike, unbranched or branched. |
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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. |
4-merous, nearly actinomorphic, opening near sunrise; floral tube 6–17 mm; sepals 4–6 mm; petals white, fading off-white or tinged pink, slightly unequal, rhombic, 4–6 mm, abruptly clawed; filaments 5–8 mm, anthers 1.5–2 mm, pollen 85–100% fertile; style 6–10, stigma exserted beyond anthers at anthesis. |
Capsules | ascending to erect, straight, fusiform, weakly 4-angled, 10–20 × 3–5 mm, dehiscent 1/2 their length; sessile. |
ovoid, 4-angled, somewhat flattened, 3–4 × 1.5–2.3 mm, valves with raised midrib and conspicuous lateral veins; sessile. |
Seeds | in 2 rows per locule, ellipsoid to subglobose, 1.5–2 × 1.2–1.5 mm, surface regularly pitted, pits in longitudinal lines. |
1, pale yellow, oblanceoloid, 2.4–2.6 × 1–1.5 mm. |
2n | = 14, 28. |
= 14. |
Oenothera coronopifolia |
Oenothera glaucifolia |
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Phenology | Flowering (Mar–)Jun–Aug(–Sep). | Flowering May–Oct(–Nov). |
Habitat | Dry, open sites, grassy meadows, slopes, along drainages, foothills and mountains. | Rocky prairie slopes and outcrops or bluffs, along streams, roadsides, usuallyon limestone. |
Elevation | 1500–3000 m. (4900–9800 ft.) | 200–1300 m. (700–4300 ft.) |
Distribution |
AZ; CO; ID; NE; NM; SD; UT; WY
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AR; CO; KS; MO; NE; NM; OK; TX; WY
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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.) |
Oenothera glaucifolia is self-incompatible, the flowers diurnal, pollinated primarily by wasps (R. Clinebell, unpubl.), as well as bees, flies, butterflies, and occasionally beetles (summarized by W. L. Wagner et al. 2007). It was collected once in 1988 in Indiana at Miller Woods Visitor Center (Lake County), Dritz 596 (MOR); it seems likely that it was introduced, and has not been collected there since. Stenosiphon virgatus Spach is a superfluous name and pertains here. (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. Kleinia | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Gaura > subsect. Stenosiphon |
Sibling taxa | ||
Synonyms | Anogra coronopifolia | Gaura linifolia, Stenosiphon linifolius |
Name authority | Torrey & A. Gray: Fl. N. Amer. 1: 495. (1840) | W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 212. (2007) |
Web links |