Oenothera grandis |
Oenothera havardii |
|
---|---|---|
largeflower eveningprimrose, showy evening-primrose |
Havard's evening primrose |
|
Habit | Herbs annual, strigillose and sparsely villous, also glandular puberulent distally. | Herbs compact to sprawling, strigillose; from a taproot, lateral roots producing adventitious shoots. |
Stems | erect to ascending, often with ascending lateral branches, 15–60(–100) cm. |
usually many-branched, sometimes unbranched, often twining among vegetation, sometimes rooting at nodes, 5–25(–70) cm. |
Leaves | in a basal rosette and cauline, basal 5–13 × 1–3 cm, cauline 3–10 × 1.5–3.5 cm; blade green, narrowly oblanceolate to narrowly elliptic, margins lobed or dentate, lobes often dentate; bracts spreading, flat. |
in a basal rosette and cauline, basal usually quickly deciduous, (1–)2–5 × (0.2–)0.5–1.5 cm; petiole 0–0.6 cm; blade oblanceolate, linear-lanceolate to linear distally, margins few toothed to pinnately lobed to sinuate-dentate distally. |
Flowers | 1–few opening per day near sunset; buds erect, with free tips terminal, erect or hornlike, 1.5–5 mm; floral tube 25–45 mm; sepals 15–30 mm; petals yellow, very broadly obovate or shallowly obcordate, 25–40 mm; filaments 12–22 mm, anthers 4–11 mm, pollen 85–100% fertile; style 40–75 mm, stigma exserted beyond anthers at anthesis. |
1–few opening per day near sunset; buds often twisted, free tips coherent; floral tube (37–)45–60(–65) mm; sepals (16–)18–26(–30) mm; petals lemon-yellow, fading orange-red to reddish purple, usually elliptic, sometimes oblanceolate, (18–)21–30(–32) mm; filaments 15–18(–22) mm, anthers red, 6–13 mm; style (55–)65–86(–94) mm, stigma exserted beyond anthers at anthesis. |
Capsules | cylindrical, sometimes slightly enlarged toward apex, 25–50 ×2–3 mm. |
woody, narrowly ovoid to ovoid, 4-angled, 8–13(–16) × 3–4 mm, apex tapering to a short sterile beak 2–3 mm, valves with a prominent, broad midrib and capsule appearing 8-ribbed, tardily dehiscent ca. 1/3 capsule length. |
Seeds | broadly ellipsoid to subglobose, 0.8–1.5 × 0.5–0.9 mm. |
2–2.5(–3.3) × 1.2–1.5 mm, sometimes with a small wing at distal end or a raised ridge along one longitudinal margin. |
2n | = 14. |
= 14, 28. |
Oenothera grandis |
Oenothera havardii |
|
Phenology | Flowering Mar–Sep. | Flowering Apr–Oct. |
Habitat | Open, sandy sites. | In depressions, seasonally wet flats, stream banks, margins of irrigated fields, sandy or clay soil, among tufted grasses like Sporobolus wrightii, primarily in Chihuahuan Desert. |
Elevation | 0–1500(–2200) m. (0–4900(–7200) ft.) | 1300–2000 m. (4300–6600 ft.) |
Distribution |
AL; AR; CO; CT; FL; IL; IN; KS; LA; MD; MI; MO; NC; NE; NJ; NM; TX; Mexico (Tamaulipas)
|
AZ; TX; Mexico (Chihuahua, Durango, Sonora, Zacatecas) |
Discussion | Oenothera grandis is probably native to eastern New Mexico and Colorado, Arkansas, Kansas, Louisiana, Missouri, Nebraska, Oklahoma, and Texas, and northeastern Tamaulipas, Mexico. Scattered collections made in other states probably represent introductions (W. Dietrich and W. L. Wagner 1988). Oenothera grandis is self-incompatible (W. Dietrich and W. L. Wagner 1988). Oenothera laciniata Hill var. occidentalis Small and O. laciniata var. grandis Britton are illegitimate superfluous names based on O. sinuata Linnaeus var. grandiflora S. Watson and pertain here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera havardii ranges from Brewster and Presidio counties, Texas, and Cochise County, Arizona, south to Durango and Zacatecas, Mexico. W. L. Wagner (1984) found that O. havardii is self-incompatible and vespertine. (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. Oenothera > subsect. Raimannia | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Paradoxus |
Sibling taxa | ||
Synonyms | O. laciniata var. grandiflora, O. sinuata var. grandiflora, Raimannia grandis | Hartmannia havardii, H. palmeri |
Name authority | Smyth: Trans. Kansas Acad. Sci. 16: 160. (1899) | S. Watson: Proc. Amer. Acad. Arts 20: 366. (1885) — (as havardi) |
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