Oenothera curtiflora |
Oenothera platanorum |
|
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lizard-tail, small-flower bee-blossom, small-flower gaura, velvet weed |
Fort Huachuca evening primrose |
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Habit | Herbs annual, strigillose, glandular puberulent, and long-villous; from heavy taproot, 2–4 cm diam. | Herbs perennial, caulescent, strigillose, often densely so; from slender taproot. |
Stems | erect, unbranched or many-branched distally, (20–)30–200(–300) cm. |
1–several, ascending, 5–60 cm. |
Leaves | in a basal rosette and cauline, basal 4–15 × 1.5–3 cm, petiole 0–1.8 cm, blade broadly oblanceolate, margins sinuate-dentate to dentate; cauline 2–13 × 0.5–5 cm, petiole 0–2 cm, blade narrowly elliptic to narrowly ovate, margins sinuate-dentate to dentate. |
in a basal rosette and cauline, basal 2–7 × 0.3–1.4 cm, blade narrowly elliptic to narrowly ovate, margins weakly serrulate to sinuate-pinnatifid; cauline 1.2–6 × 0.3–1 cm, blade narrowly elliptic to elliptic or ovate, proximal ones sinuate-pinnatifid, margins subentire or weakly serrulate. |
Inflorescences | relatively long, dense. |
erect. |
Flowers | 4-merous, nearly actinomorphic, opening near sunset; floral tube 1.5–5 mm; sepals 2–3.5 mm; petals white, fading pale to dark pink, slightly unequal, oblong-obovate to elliptic-oblanceolate, 1.5–3 mm, abruptly clawed; filaments 1.5–3 mm, anthers 0.5–1 mm, pollen 85–100% fertile; style 3–9 mm, stigma surrounded by anthers at anthesis. |
1–3 opening per day near sunrise; buds with free tips 0–0.1 mm; floral tube 9–14 mm; sepals 7.5–13 mm; petals rose purple, fading darker, 8–15 mm; filaments 4–9 mm, anthers 2.5–4 mm, pollen 85–100% fertile; style 12–19 mm, stigma surrounded by anthers at anthesis. |
Capsules | fusiform, terete, weakly angled in distal 1/3, angles becoming broad and rounded in proximal part, 5–11 × 1.5–3 mm, tapering abruptly toward base; sessile. |
clavate or narrowly obovoid, 9–14 × 3–4 mm, apex attenuate to a sterile beak, valve midrib prominent in distal part, proximal stipe 4–15 mm, gradually tapering to base; sessile. |
Seeds | 3 or 4, reddish brown, 2–3 × 1–1.5 mm. |
narrowly obovoid, 0.7–0.9 × 0.3–0.5 mm. |
2n | = 14. |
= 14. |
Oenothera curtiflora |
Oenothera platanorum |
|
Phenology | Flowering (Feb–)Apr–Oct. | Flowering Mar–Aug. |
Habitat | Rocky prairie slopes, woodlands, along streams, roadsides, disturbed areas. | Streambeds and near springs. |
Elevation | 10–2800 m. (0–9200 ft.) | 700–1900 m. (2300–6200 ft.) |
Distribution |
AL; AR; AZ; CA; CO; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; MN; MO; MT; NE; NM; NV; OK; OR; SC; SD; TN; TX; UT; VA; WA; WY; Mexico (Baja California, Chihuahua, Coahuila, Durango, Nuevo León, Sinaloa, Zacatecas) [Introduced in South America (Argentina), Asia (China, Japan), Australia]
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AZ; Mexico (Sonora) |
Discussion | Oenothera curtiflora is self-compatible and autogamous (P. H. Raven and D. P. Gregory 1972[1973]). Sometimes it is apparently a biennial. The species is native to grassland regions and open areas across much of interior North America. The full extent of its indigenous range is not clear and collections from the eastern half of the United States (Alabama, Florida, Georgia, Indiana, Massachusetts, and Tennessee) and California may be more recent introductions. Gaura mollis Nuttall ex Torrey 1827 is an isonym of G. mollis E. James 1822, a suppressed name. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera platanorum is known only from the southeastern counties of Cochise, Pinal, and Santa Cruz in Arizona. It was recently collected in Sonora, Mexico. The species is very similar to both O. texensis, from which it differs in its smaller flowers, and the widespread O. rosea, from which it differs in the somewhat larger flowers and in forming seven bivalents in meiosis and fully fertile pollen, whereas O. rosea is a PTH species. (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. Schizocarya | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Hartmannia |
Sibling taxa | ||
Synonyms | Gaura parviflora, G. australis, G. hirsuta, G. micrantha, G. parviflora var. lachnocarpa, Schizocarya micrantha | |
Name authority | W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 211. (2007) | P. H. Raven & D. R. Parnell: Madroño 20: 246. (1970) |
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