Oenothera glaucifolia |
Oenothera drummondii |
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false gaura |
beach evening-primrose |
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Habit | Herbs probably biennial, glabrous, becoming sparsely to densely glandular puberulent and short-villous distally, glaucous at least in proximal parts; from stout roots. | |
Stems | erect, branched or unbranched, 30–300 cm. |
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Leaves | 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. |
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Inflorescences | long, wandlike, unbranched or branched. |
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Flowers | 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. |
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Capsules | ovoid, 4-angled, somewhat flattened, 3–4 × 1.5–2.3 mm, valves with raised midrib and conspicuous lateral veins; sessile. |
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Seeds | 1, pale yellow, oblanceoloid, 2.4–2.6 × 1–1.5 mm. |
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Subspecies | thalassaphila (Brandegee) W. |
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Dietrich | & W. |
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l | . |
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Wagner | differs from subsp. drummondii in a number of modally distinctive morphological features, especially floral tubes 2–3.5 cm, sepal tips 0.3–1 mm, capsules 2–4 cm × 2.5–5 mm in diameter and those, coupled with the great disjunction from the Atlantic coast of the United States and Mexico to the southern tip of Baja California, make it worthy of recognition. |
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Oenothera | drummondii is self-compatible and outcrossing. |
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2n | = 14. |
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Oenothera glaucifolia |
Oenothera drummondii |
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Phenology | Flowering May–Oct(–Nov). | |
Habitat | Rocky prairie slopes and outcrops or bluffs, along streams, roadsides, usuallyon limestone. | |
Elevation | 200–1300 m. (700–4300 ft.) | |
Distribution |
AR; CO; KS; MO; NE; NM; OK; TX; WY
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n Mexico; s United States
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Discussion | 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.) |
Subspecies 2 (1 in the flora). (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. Gaura > subsect. Stenosiphon | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Raimannia |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Gaura linifolia, Stenosiphon linifolius | Raimannia drummondii |
Name authority | W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 212. (2007) | Hooker: Bot. Mag. 61: plate 3361. (1834) |
Web links |