Oenothera linifolia |
Oenothera grandis |
|
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threadleaf evening-primrose, threadleaf sundrop |
largeflower eveningprimrose, showy evening-primrose |
|
Habit | Herbs annual, caulescent, strigillose or glabrous, also often glandular puberulent, especially distally; from a sparsely branched taproot. | Herbs annual, strigillose and sparsely villous, also glandular puberulent distally. |
Stems | unbranched or with many ascending branches arising near base, erect, 10–50 cm. |
erect to ascending, often with ascending lateral branches, 15–60(–100) cm. |
Leaves | in a basal rosette and cauline, basal 1–2(–4) × 0.2–0.6 cm, petiole 0.2–1(–1.5) cm, blade ovate to obovate or narrowly elliptic; cauline 1–4 × less than 0.1 cm, sessile, blade linear or filiform. |
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. |
Flowers | usually 1–3 opening per day near sunrise; buds without free tips; sepals 1.5–2 mm; petals bright yellow, fading pink, obcordate to obovate, 3–5(–7) mm; filaments 1–2 mm, anthers 0.5–1 mm; style 1–2 mm, stigma surrounded by anthers at anthesis. |
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. |
Capsules | ellipsoid-rhombic to subglobose, 4-angled, 4–6(–10) × 1.5–3 mm, stipe 0–4 mm, valve midrib raised at distal end, indehiscent or tardily dehiscent distally; sessile. |
cylindrical, sometimes slightly enlarged toward apex, 25–50 ×2–3 mm. |
Seeds | clustered in each locule, ovoid, surface minutely papillose, 1 × 0.5 mm. |
broadly ellipsoid to subglobose, 0.8–1.5 × 0.5–0.9 mm. |
2n | = 14. |
= 14. |
Oenothera linifolia |
Oenothera grandis |
|
Phenology | Flowering Apr–Jun(–Aug). | Flowering Mar–Sep. |
Habitat | Prairies, open woodlands, open rocky and sandy sites, roadsides. | Open, sandy sites. |
Elevation | 0–400 m. (0–1300 ft.) | 0–1500(–2200) m. (0–4900(–7200) ft.) |
Distribution |
AL; AR; FL; GA; IL; KS; KY; LA; MO; MS; NC; OK; SC; TN; TX
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AL; AR; CO; CT; FL; IL; IN; KS; LA; MD; MI; MO; NC; NE; NJ; NM; TX; Mexico (Tamaulipas)
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Discussion | Kneiffia linearifolia Spach (1835) is an illegitimate name based on Oenothera linifolia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 10. | FNA vol. 10. |
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Peniophyllum | Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Oenothera > subsect. Raimannia |
Sibling taxa | ||
Synonyms | Kneiffia linifolia, O. linifolia var. glandulosa, Peniophyllum linifolium | O. laciniata var. grandiflora, O. sinuata var. grandiflora, Raimannia grandis |
Name authority | Nuttall: J. Acad. Nat. Sci. Philadelphia 2: 120. (1821) | Smyth: Trans. Kansas Acad. Sci. 16: 160. (1899) |
Web links |