Oenothera coronopifolia |
Oenothera cordata |
|
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crownleaf evening primrose |
heartleaf evening primrose |
|
Habit | Herbs perennial, strigillose, usually also hirsute; from a taproot, lateral roots producing adventitious shoots. | Herbs annual or biennial, densely to sparsely strigillose, glandular puberulent or sometimes also sparsely villous distally. |
Stems | ascending to erect, 1–several from base, these unbranched to well-branched, 10–60 cm. |
unbranched or branched primarily distally, 25–70 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 6–12 × 0.7–2 cm, cauline 2–10 ×0.5–3 cm; subsessile; blade narrowly elliptic to oblanceolate, gradually narrowly lanceolate to lanceolate, elliptic, or ovate distally, margins lobed to remotely dentate or subentire; bracts shorter than capsule they subtend, 0.5–1.7 cm. |
Inflorescences | open, lax, usually unbranched, mature buds usually overtopping spike apex. |
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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. |
1–few per spike opening per day near sunset; buds erect, with free tips erect, 1–3 mm; floral tube nearly straight, 20–40 mm; sepals 15–25 mm; petals yellow, broadly elliptic to rhombic-ovate, 20–30 mm; filaments 17–22 mm, anthers 4–7 mm, pollen 85–100% fertile; style 50–65 mm, stigma usually 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. |
narrowly lanceoloid, 15–33 × 2–3 mm. |
Seeds | in 2 rows per locule, ellipsoid to subglobose, 1.5–2 × 1.2–1.5 mm, surface regularly pitted, pits in longitudinal lines. |
dark brown, ellipsoid, 1–1.4 ×0.4–0.6 mm. |
2n | = 14, 28. |
= 14. |
Oenothera coronopifolia |
Oenothera cordata |
|
Phenology | Flowering (Mar–)Jun–Aug(–Sep). | Flowering Apr–Jul. |
Habitat | Dry, open sites, grassy meadows, slopes, along drainages, foothills and mountains. | Sandy, open places in oak woodlands. |
Elevation | 1500–3000 m. (4900–9800 ft.) | 30–200 m. (100–700 ft.) |
Distribution |
AZ; CO; ID; NE; NM; SD; UT; WY
|
TX |
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 cordata is self-incompatible. It occurs in a narrow range in eastern Texas (Austin, Bastrop, Colorado, Fayette, Guadalupe, Goliad, Matagorda, San Patricio, Victoria, Waller, and Wilson). It apparently occasionally hybridizes with O. heterophylla subsp. heterophylla where their ranges come together. Oenothera bifrons D. Don 1838 (not Lindley 1831) 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. Oenothera > subsect. Candela |
Sibling taxa | ||
Synonyms | Anogra coronopifolia | |
Name authority | Torrey & A. Gray: Fl. N. Amer. 1: 495. (1840) | J. W. Loudon: Ladies’ Flower-gard. Ornam. Perenn. 1: 167. (1843) |
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