Oenothera hartwegii subsp. filifolia

(Eastwood) W. L. Wagner & Hoch

Syst. Bot. Monogr. 83: 212. 2007.

Basionym: Oenothera tubicula var. filifolia Eastwood Proc. Calif. Acad. Sci., ser. 3, 1: 72, plate 6, fig. 1. 1897
Synonyms: Calylophus hartwegii subsp. filifolius (Eastwood) Towner & P. H. Raven C. hartwegii var. filifolius (Eastwood) Shinners Galpinsia filifolia (Eastwood) A. Heller O. filifolia (Eastwood) Tidestrom O. hartwegii var. filifolia (Eastwood) Munz
Treatment appears in FNA Volume 10.

Herbs glandular puberulent throughout, more densely so on distal parts, sometimes also sparsely strigillose on ovaries and leaves. Leaves 0.3–4 × 0.04–0.3(–0.4) cm, fascicles of small leaves to 1.5 cm often present in axils; blade filiform to narrowly lanceolate, base attenuate, margins entire or remotely serrulate, sometimes undulate. Flowers: buds with free tips 0.5–4 mm; floral tube 16–50 mm; sepals 7–17 mm; petals 12–23 mm; filaments 6–13 mm, anthers 6–11 mm; style 26–60 mm. 2n = 14.


Phenology: Flowering May–Oct.
Habitat: Highly local, often abundant, almost always on semiarid gypsum flats, dunes, or outcrops, with Juniperus, Larrea, and Yucca.
Elevation: 600–1900 m.

Distribution

N.Mex., Tex., Mexico (Chihuahua, Coahuila, Zacatecas).

Discussion

Subspecies filifolia occurs in Otero and Torrance counties in southeastern New Mexico, south and east through the Trans-Pecos and southern Panhandle of Texas to Cottle County in Texas, and southward from widely scattered localities in central Chihuahua, Coahuila, and Zacatecas, Mexico.

Selected References

None.

Lower Taxa

None.
Warren L. Wagner +
(Eastwood) W. L. Wagner & Hoch +
Oenothera tubicula var. filifolia +
N.Mex. +, Tex. +, Mexico (Chihuahua +, Coahuila +  and Zacatecas). +
600–1900 m. +
Highly local, often abundant, almost always on semiarid gypsum flats, dunes, or outcrops, with Juniperus, Larrea, and Yucca. +
Flowering May–Oct. +
Syst. Bot. Monogr. +
Calylophus hartwegii subsp. filifolius +, C. hartwegii var. filifolius +, Galpinsia filifolia +, O. filifolia +  and O. hartwegii var. filifolia +
Oenothera hartwegii subsp. filifolia +
Oenothera hartwegii +
subspecies +