Oenothera hartwegii subsp. hartwegii
Oenothera hartwegii subsp. maccartii
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.
0.6–3.5 × 0.1–0.6 cm, fascicles of small leaves to 1.5 cm usually present in axils;
blade usually narrowly lanceolate to lanceolate or oblanceolate, rarely linear, base attenuate, margins subentire or serrulate, usually crinkled-undulate or 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 1–6 mm;
floral tube 17–45 mm;
sepals 11–27 mm;
petals 10–30 mm;
filaments 6–12 mm, anthers 5–9 mm;
style 25–60 mm.
= 14, 28.
= 14, 28.
Oenothera hartwegii subsp. hartwegii
Oenothera hartwegii subsp. maccartii
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 maccartii occurs on the south Texas Plains and along the Rio Grande from Kinney, Milam, Uvalde, and Val Verde counties south to southeastern Coahuila, central Nuevo León, and northwestern Tamaulipas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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