Oenothera hartwegii subsp. hartwegii
Oenothera hartwegii subsp. fendleri
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.
1–5 × 0.15–1 cm, fascicles of small leaves to 1 cm (when present);
blade linear to oblanceolate or lanceolate, base attenuate to obtuse, rarely nearly clasping, margins entire or subentire, rarely undulate.
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.
buds with free tips 0.5–3 mm;
floral tube 30–50 mm;
sepals 9–28 mm;
petals 10–30 mm;
filaments 5–12 mm, anthers 5–13 mm;
style 40–75 mm.
= 14, 28.
= 14.
Oenothera hartwegii subsp. hartwegii
Oenothera hartwegii subsp. fendleri
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Subspecies fendleri is known from Barber, Comanche, and Morton counties, Kansas, south through western Oklahoma and scattered sites in the Texas Panhandle to eastern Chihuahua, central trans-Pecos Texas, central and western New Mexico, and east-central Arizona. It is the most distinctive subspecies in the complex.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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