Oenothera hartwegii subsp. filifolia (Eastw.) W.L. Wagner & Hoch (Unresolved), Syst. Bot. Monogr. 83: 212 212 2007. (Syn: Calylophus hartwegii var. filifolius (Eastw.) Shinners; Calylophus hartwegii subsp. filifolius (Eastw.) Towner &
P.H.Raven; Oenothera filifolius (Eastw.) Tidestrom; Oenothera hartwegii var. filifolia (Eastw.) Munz; Oenothera tubicula var. filifolia Eastw.);
USA (New Mexico, Texas), Mexico (Sonora, Chihuahua, Coahuila) as per Catalogue of life;
Oenothera hartwegii Benth, subsp. fendleri, Fendler’s Evening Primrose (Fendler’s Sundrops) from California: 4 images.
Oenothera hartwegii Benth. subsp. fendleri (A. Gray) W. L. Wagner & Hoch
Calylophus hartwegii subsp. fendleri (A. Gray) Towner & P. H. Raven
Oenothera fendleri A. Gray (basionym)
A small perennial growing in clumps with slender branches, older becoming woody; Leaves linear, needle-like up to 2.5 cm long; flowers in small clusters, yellow, about 3 cm across, turning orange towards the end of the day
Cultivated in dry places, suitable for rockeries. Photographed in Sunnyvale, California.
Another example of the confusion within The Plant List, which treats this taxon along with many others under genus Calylophus established by Raven in 1964, whereas in 2007 revision of the family Onagraceae (Raven again being an author) Calylophus is merged under genus Oenothera. GRIN updated in February 2009 has incorporated this latest treatment, but the Plant List updated in 2010 is unaware of this.