Oenothera linifolia |
Oenothera filipes |
|
---|---|---|
threadleaf evening-primrose, threadleaf sundrop |
slenderstalk beeblossom |
|
Habit | Herbs annual, caulescent, strigillose or glabrous, also often glandular puberulent, especially distally; from a sparsely branched taproot. | Herbs perennial, clumped, sparsely to densely strigillose, inflorescence usually glabrous or glandular puberulent, sometimes proximalmost parts villous, hairs erect, 1–2 mm; from heavy, twisted, woody rootstock. |
Stems | unbranched or with many ascending branches arising near base, erect, 10–50 cm. |
erect, branched below and just above ground, branched also proximal to inflorescences, 60–250(–300) 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, (1–)3–9 × (0.1–)0.5–1.3 cm, blade linear or narrowly lanceolate to narrowly oblanceolate, margins slightly to coarsely sinuate-dentate. |
Inflorescences | slender, often well-branched, buds small and well-spaced. |
|
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 near sunset; floral tube 2.5–6 mm; sepals 5–12.5 mm; petals white, fading pink to red, slightly unequal, elliptic, 5–10 mm, clawed; stamens presented evenly around flower parts, filaments 3–8.5 mm, anthers 1.4–4 mm, pollen 90–100% fertile; style 8.5–19 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. |
ovoid, narrowly 4-winged or 4-angled, 5–10 × 1.5–2 mm, abruptly constricted to a sterile stipe 0.5–4.5 mm. |
Seeds | clustered in each locule, ovoid, surface minutely papillose, 1 × 0.5 mm. |
1 or 2, yellowish to reddish brown, 1.5–3.5 × 1–1.5 mm. |
2n | = 14. |
= 14. |
Oenothera linifolia |
Oenothera filipes |
|
Phenology | Flowering Apr–Jun(–Aug). | Flowering May–Sep(–Oct). |
Habitat | Prairies, open woodlands, open rocky and sandy sites, roadsides. | Sandy hills and flats, open woods. |
Elevation | 0–400 m. (0–1300 ft.) | 0–300 m. (0–1000 ft.) |
Distribution |
AL; AR; FL; GA; IL; KS; KY; LA; MO; MS; NC; OK; SC; TN; TX
|
AL; FL; GA; IL; IN; KY; LA; MO; MS; SC; TN
|
Discussion | Kneiffia linearifolia Spach (1835) is an illegitimate name based on Oenothera linifolia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera filipes occurs marginally in several states, including: southernmost Illinois and southern Indiana; northern Florida; southeastern Mississippi; and, Washington Parish, Louisiana. P. H. Raven and D. P. Gregory (1972[1973]) determined O. filipes to be self-incompatible. (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. Stipogaura |
Sibling taxa | ||
Synonyms | Kneiffia linifolia, O. linifolia var. glandulosa, Peniophyllum linifolium | Gaura filipes, G. filipes var. major, G. michauxii |
Name authority | Nuttall: J. Acad. Nat. Sci. Philadelphia 2: 120. (1821) | (Spach) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 212. (2007) |
Web links |