Oenothera texensis

P. H. Raven & D. R. Parnell

Madroño 20: 247. 1970.

Treatment appears in FNA Volume 10.
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Herbs perennial, caulescent, strigillose and also sparsely hirsute; from slender taproot. Stems several–many, ascending, unbranched or branched, 25–50 cm. Leaves in a basal rosette and cauline, basal (1–)2.5–6.5 × 0.6–2.3 cm, blade narrowly elliptic to narrowly ovate or ovate, margins weakly serrulate to sinuate-pinnatifid; cauline 1–5.5 × 0.6–2 cm, blade narrowly elliptic to narrowly ovate, margins weakly serrulate. Inflores­cences erect. Flowers 1–3 opening per day near sunrise; buds with free tips 0–1 mm; floral tube 15–26 mm; sepals 15–23 mm; petals rose purple, fading darker, 12–25(–30) mm; filaments 9–13 mm, anthers 3.5–6mm, pollen 85–100% fertile; style 26–36 mm, stigma exserted beyond anthers at anthesis. Capsules clavate or narrowly obovoid, 9–15 × 3.5–6 mm, apex atten­uate to a sterile beak, valve midrib prominent in distal part, proximal stipe 7–12(–28) mm, gradually taperingto base; sessile. Seeds narrowly obovoid, 0.8–1 × 0.2–0.4 mm. 2n = 14.


Phenology: Flowering May–Sep.
Habitat: Sandy and gravel bars of streambeds and along streams.
Elevation: 900–2500 m.

Distribution

Tex., Mexico (Coahuila, Tamaulipas).

Discussion

In the flora area, Oenothera texensis is known only from Jeff Davis County.

Selected References

None.

Lower Taxa

None.
... more about "Oenothera texensis"
Warren L. Wagner +
P. H. Raven & D. R. Parnell +
Hartmannia +
Tex. +, Mexico (Coahuila +  and Tamaulipas). +
900–2500 m. +
Sandy and gravel bars of streambeds and along streams. +
Flowering May–Sep. +
Oenothera +, Oenothera subg. Hartmannia +, Oenothera sect. Xylopleurum +, Oenothera subg. Xylopleurum +  and Xylopleurum +
Oenothera texensis +
Oenothera sect. Hartmannia +
species +