Oenothera linifolia |
Oenothera lindheimeri |
|
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threadleaf evening-primrose, threadleaf sundrop |
Lindheimer's beeblossom |
|
Habit | Herbs annual, caulescent, strigillose or glabrous, also often glandular puberulent, especially distally; from a sparsely branched taproot. | Herbs clumped perennial, villous, usually more densely so proximally, hairs erect or ± appressed on leaf blades, also glandular puberulent distally, rarely glabrate; from taproot. |
Stems | unbranched or with many ascending branches arising near base, erect, 10–50 cm. |
many from base, ascending or erect, usually branched, 50–150 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, 0.5–9 × 0. |
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. |
4-merous, zygomorphic, opening at sunrise; floral tube 4–9 mm; sepals 9–17 mm; petals white, fading light or deep pink, rhombic-obovate to elliptic, 10–15 mm; filaments 7–12 mm, anthers 3.5–4.5 mm, pollen 90–100% fertile; style 16–27 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. |
ellipsoid or ovoid, 4-angled, 6–9 × 2–3.5 mm; sessile. |
Seeds | clustered in each locule, ovoid, surface minutely papillose, 1 × 0.5 mm. |
1–4, yellowish to light brown, 2–3 × 1–1.5 mm. |
1 | –1.3 cm; blade narrowly elliptic to narrowly oblanceolate, margins coarsely and remotely serrate. |
|
2n | = 14. |
= 14. |
Oenothera linifolia |
Oenothera lindheimeri |
|
Phenology | Flowering Apr–Jun(–Aug). | Flowering Apr–Jul(–Oct). |
Habitat | Prairies, open woodlands, open rocky and sandy sites, roadsides. | Black soil in coastal prairies. |
Elevation | 0–400 m. (0–1300 ft.) | 0–100 m. (0–300 ft.) |
Distribution |
AL; AR; FL; GA; IL; KS; KY; LA; MO; MS; NC; OK; SC; TN; TX
|
LA; TX |
Discussion | Kneiffia linearifolia Spach (1835) is an illegitimate name based on Oenothera linifolia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera lindheimeri has a fairly narrow distribution and occurs only in Acadia, Allen, Beauregard, Calcasieu, Jefferson Davis, Lafayette, St. Mary, Tangipahoa, and Vermillion parishes in Louisiana, and Brazoria, Brazos, Chambers, Fort Bend, Galveston, Hardin, Harris, Jasper, Jefferson, Liberty, Orange, Victoria, and Victoria counties in Texas. P. H. Raven and D. P. Gregory (1972[1973]) found Oenothera lindheimeri to be self-incompatible. It occasionally forms hybrids with O. filiformis. This species is widely cultivated and has many different cultivars. (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. Gaura > subsect. Gaura |
Sibling taxa | ||
Synonyms | Kneiffia linifolia, O. linifolia var. glandulosa, Peniophyllum linifolium | Gaura lindheimeri, G. filiformis var. munzii |
Name authority | Nuttall: J. Acad. Nat. Sci. Philadelphia 2: 120. (1821) | (Engelmann & A. Gray) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 213. (2007) |
Web links |