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Habit Herbs usually sparsely strigillose, sometimes glandular puberulent. Herbs usually glabrous throughout, sometimes glandular puberulent on distal parts, especially on ovaries.
Leaves

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.

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.

Flowers

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.

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.

2n

= 14, 28.

= 14.

Oenothera hartwegii subsp. maccartii

Oenothera hartwegii subsp. fendleri

Phenology Flowering Mar–Sep. Flowering Apr–Oct.
Habitat Grasslands, sandy to gravelly soil, limestone, with Acacia, Larrea, Opuntia, Prosopis, and Yucca. In scattered populations on clay or gravelly soil, sometimes calcareous, in grasslands, often with Juniperus and Prosopis, to woodlands with Juniperus, Pinus edulis, sometimes Pinus ponderosa.
Elevation 30–1500 m. (100–4900 ft.) 300–2200 m. (1000–7200 ft.)
Distribution
from FNA
TX; Mexico (Coahuila, Nuevo León, Tamaulipas)
[BONAP county map]
from FNA
AZ; KS; NM; OK; TX; Mexico (Chihuahua)
[BONAP county map]
Discussion

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.)

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.)

Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Calylophus > subsect. Salpingia > Oenothera hartwegii 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. hartwegii, O. hartwegii subsp. pubescens
O. hartwegii subsp. filifolia, O. hartwegii subsp. hartwegii, O. hartwegii subsp. maccartii, O. hartwegii subsp. pubescens
Synonyms Calylophus hartwegii var. maccartii O. fendleri, Calylophus hartwegii subsp. fendleri, Galpinsia fendleri, G. hartwegii var. fendleri, O. hartwegii var. fendleri
Name authority (Shinners) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 212. (2007) (A. Gray) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 212. (2007)
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