Oenothera hartwegii subsp. hartwegii

Synonyms: Oenothera greggii var. pringlei Munz O. pringlei (Munz) Munz
Treatment appears in FNA Volume 10.

Herbs sparsely to densely strig­illose throughout, more densely so on distal parts. Leaves 1–3.5 × 0.05–0.4 cm, fascicles of small leaves 0.2–1.5 cm usually present in axils; blade narrowly lanceolate, sometimes linear, base attenuate, margins entire or shallowly and sparsely serrulate, sometimes undulate. Flowers: buds with free tips (1–)2–6 mm; floral tube (18–)30–50(–60) mm; sepals 8–20 mm; petals 13–30 mm; filaments 5–10 mm, anthers 5–9 mm; style 30–65(–75) mm. 2n = 14, 28.

Phenology: Flowering Feb–Oct.
Habitat: Rocky or gravelly soil, sometimes limestone, grasslands, conifer woodlands.
Elevation: 900–2300 m.


Tex., Mexico (Aguascalientes, Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Zacatecas).


Subspecies hartwegii is the most southerly distributed among the taxa in sect. Calylophus, occurring widely from western Texas south into northern Mexico. It is often found in canyons and high plains in the northern part of its range, and reaching pine forests at its southern limits. It is weakly distinct from subsp. maccartii.

Selected References


Lower Taxa

Warren L. Wagner +
Bentham +
Oenothera +
Tex. +, Mexico (Aguascalientes +, Chihuahua +, Coahuila +, Durango +, Nuevo León +, San Luis Potosí +  and Zacatecas). +
900–2300 m. +
Rocky or gravelly soil, sometimes limestone, grasslands, conifer woodlands. +
Flowering Feb–Oct. +
Pl. Hartw., +
Oenothera greggii var. pringlei +  and O. pringlei +
Oenothera hartwegii subsp. hartwegii +
Oenothera hartwegii +
subspecies +