Flora of North America species comparison

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Oenothera hartwegii subsp. hartwegii
Photo is of parent taxon
Habit 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.

Oenothera hartwegii subsp. hartwegii
Phenology Flowering Feb–Oct.
Habitat Rocky or gravelly soil, sometimes limestone, grasslands, conifer woodlands.
Elevation 900–2300 m. (3000–7500 ft.)
Distribution
from FNA
TX; Mexico (Aguascalientes, Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Zacatecas)
[BONAP county map]
Discussion

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.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Calylophus > subsect. Salpingia > Oenothera hartwegii
Sibling taxa
O. hartwegii subsp. fendleri, O. hartwegii subsp. filifolia, O. hartwegii subsp. maccartii, O. hartwegii subsp. pubescens
Synonyms O. greggii var. pringlei, O. pringlei
Name authority unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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