Oenothera curtiflora |
Oenothera speciosa |
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lizard-tail, small-flower bee-blossom, small-flower gaura, velvet weed |
Mexican evening primrose, pinkladies, showy 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, glabrate to strigillose, usually also sparsely hirsute; from slender taproot and spreading by rhizomes. |
Stems | erect, unbranched or many-branched distally, (20–)30–200(–300) cm. |
many, erect, 4–60 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 2–9 × 0.3–3.2 cm, blade oblanceolate to obovate, margins subentire or sinuate-pinnatifid; cauline 1–10 × 0.3–3.5 cm, blade narrowly elliptic to ovate, margins subentire or serrulate to sinuate-pinnatifid. |
Inflorescences | relatively long, dense. |
sharply nodding. |
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 in some populations, near sunset in others; buds with free tips 0–4 mm; floral tube 12–25 mm; sepals 15–50 mm; petals pink to rose, fading darker, or white, fading pink, 15–45 mm; filaments 10–22 mm, anthers 6–16 mm, pollen 85–100% fertile; style 20–55 mm, stigma exserted beyond 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. |
narrowly obovoid to narrowly rhombic-ellipsoid, angled, 10–25 × 3.5–6 mm, apex attenuate to a sterile beak, valve midrib prominent, proximal stipe cylindrical, not tapering to base, (4–)8–15 mm; sessile. |
Seeds | 3 or 4, reddish brown, 2–3 × 1–1.5 mm. |
narrowly obovoid, 1–1.2 × 0.5–0.6 mm. |
2n | = 14. |
= 14, 28, 42. |
Oenothera curtiflora |
Oenothera speciosa |
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Phenology | Flowering (Feb–)Apr–Oct. | Flowering (Feb–)Apr–Jul(–Oct). |
Habitat | Rocky prairie slopes, woodlands, along streams, roadsides, disturbed areas. | Grasslands, glades, open woodlands, disturbed places, pastures, railroads, roadsides, loamy or sandy soil, sometimes clay. |
Elevation | 10–2800 m. (0–9200 ft.) | 10–900 m. (0–3000 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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AR; IA; IL; IN; KS; LA; MO; NE; NM; OK; TX; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Tamaulipas)
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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 speciosa is widely cultivated worldwide for its showy flowers and easy maintenance. It is not known to be definitely naturalized, but tends to persist or become adventive due to its aggressive vegetative reproduction. (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 | Hartmannia berlandieri, H. reverchonii, O. berlandieri, O. delessertiana, O. hirsuta, O. obtusifolia, O. shimekii, O. spachii, O. speciosa var. berlandieri, O. speciosa var. childsii, O. tetraptera var. childsii, Xylopleurum berlandieri, X. drummondii, X. hirsutum, X. obtusifolium, X. speciosum |
Name authority | W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 211. (2007) | Nuttall: J. Acad. Nat. Sci. Philadelphia 2: 119. (1821) |
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