Oenothera linifolia |
Oenothera boquillensis |
|
---|---|---|
threadleaf evening-primrose, threadleaf sundrop |
Rio Grande beeblossom |
|
Habit | Herbs annual, caulescent, strigillose or glabrous, also often glandular puberulent, especially distally; from a sparsely branched taproot. | Herbs perennial, strigillose and glandular puberulent; from a narrow taproot. |
Stems | unbranched or with many ascending branches arising near base, erect, 10–50 cm. |
erect, usually branched several cm belowground or near base, sometimes also branched distally, 25–100 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 1–6.5(–13) × 0.4–1.5 cm, blade narrowly oblanceolate; cauline 0.5–3(–6.5) × 0.1–1.1 cm, blade very narrowly elliptic, narrowly lanceolate, or linear, margins sinuate-dentate to subentire. |
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, slightly zygomorphic, opening near sunset; floral tube 3–8.5 mm; sepals 3–9 mm; petals white, fading pink to red, slightly unequal, elliptic-obovate, 4–10 mm, clawed; filaments 2–4.5 mm, anthers 2–4 mm, pollen 85–100% fertile; style 6.5–15 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. |
erect, sometimes reflexed in age, fusiform, sometimes slightly narrowed in proximal 1/3, 5.5–13 × 1–2.5 mm, valves with inconspicuous raised midrib; sessile. |
Seeds | clustered in each locule, ovoid, surface minutely papillose, 1 × 0.5 mm. |
(1 or)2–4, yellowish or light brown, 1.5–2.5 × 0.8–1.3 mm. |
2n | = 14. |
= 14. |
Oenothera linifolia |
Oenothera boquillensis |
|
Phenology | Flowering Apr–Jun(–Aug). | Flowering May–Aug. |
Habitat | Prairies, open woodlands, open rocky and sandy sites, roadsides. | Washes, sandy canyon sides. |
Elevation | 0–400 m. (0–1300 ft.) | 600–1400 m. (2000–4600 ft.) |
Distribution |
AL; AR; FL; GA; IL; KS; KY; LA; MO; MS; NC; OK; SC; TN; TX
|
TX; Mexico (Chihuahua, Coahuila, Nuevo León) |
Discussion | Kneiffia linearifolia Spach (1835) is an illegitimate name based on Oenothera linifolia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Oenothera boquillensis has a narrow distribution in canyons from near the Rio Grande River in southern Brewster County southward into Mexico from central Chihuahua, Coahuila, and western Nuevo León. P. H. Raven and D. P. Gregory (1972[1973]) determined O. boquillensis 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. Campogaura |
Sibling taxa | ||
Synonyms | Kneiffia linifolia, O. linifolia var. glandulosa, Peniophyllum linifolium | Gaura boquillensis |
Name authority | Nuttall: J. Acad. Nat. Sci. Philadelphia 2: 120. (1821) | (P. H. Raven & D. P. Gregory) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 211. (2007) |
Web links |