Oenothera claviformis Torrey & Frémont subsp. rubescens P. H. Raven, Univ. Calif. Publ. Bot. 34: 103. 1962 (as clavaeformis); Camissonia claviformis (Torrey & Frémont) P. H. Raven subsp. rubescens (P. H. Raven) P. H. Raven

Herbs villous, at least proximally, also glandular puberulent. Stems 5–40 cm. Leaves: blade lateral lobes poorly developed, small or absent, terminal lobe lanceolate, to 4 × 2 cm, margins irregularly dentate. Flowers opening at sunset; buds with conspicuous, subapical free tips; floral tube orange-brown inside, 3.5–5 mm; petals yellow, fading brick red, 3–5 mm. 2n = 14.

Flowering Mar–Apr. Sandy flats, with Ambrosia dumosa, Carnegiea gigantea, and Larrea; 60–400 m; Ariz.; Mexico (Sonora).

Subspecies rubescens is known from western Maricopa, eastern Pima, and southeastern Yuma counties, Arizona, and northwestern Sonora. It intergrades with subsp. peeblesii and hybridizes with Chylismia brevipes subsp. arizonica.