Oenothera specicola P. H. Raven subsp. hesperia P. H. Raven, Univ. Calif. Publ. Bot. 34: 88. 1962 (as specuicola); Camissonia specicola (P. H. Raven) P. H. Raven subsp. hesperia (P. H. Raven) P. H. Raven

Herbs not woody at base. Leaf blades villous. Styles 5–7 mm, villous at base. 2n = 14.

Flowering May–Oct. Washes, dry stream beds, on limestone; of conservation concern; 300–1100 m; Ariz.

Subspecies hesperia is known from two disjunct areas along the Colorado River: Havasu and Hualapai canyons in Coconino County and from Separation to Spencer canyons in Mohave County.