Oenothera claviformis Torrey & Frémont subsp. integrior Raven, Univ. Calif. Publ. Bot. 34: 106. 1962 (as clavaeformis); Camissonia claviformis (Torrey & Frémont) P. H. Raven subsp. integrior (P. H. Raven) P. H. Raven; C. claviformis var. purpurascens (S. Watson) Cronquist; O. claviformis var. purpurascens (S. Watson) Munz; O. scapoidea Torrey & A. Gray var. purpurascens S. Watson

Herbs strigillose proximally, usually also glandular puberulent distally, or glabrate. Stems 6–70 cm. Leaves: blade sometimes purple-dotted, lateral lobes often absent, sometimes present but poorly developed, terminal lobe narrowly ovate to ovate or subcordate, to 7 × 3 cm, margins serrate. Flowers opening at sunset; buds usually without free tips, rarely with apical free tips less than 1 mm; floral tube orange-brown inside, 3–6 mm; petals white, sometimes purple-dotted near base, fading purple, 4.5–8 mm. 2n = 14.

Flowering Apr–Jun. Dry flats, with Artemisia tridentata, Ericameria, or Juniperus, on banks and flats; 1100–2200 m; Calif., Nev., Oreg.

Subspecies integrior is known from southern Harney County, Oregon, southward nearly throughout Nevada to Esmeralda and Lincoln counties and to Mono and northeastern Inyo counties, California, and often forms large colonies on banks and flats in Great Basin Desert. It intergrades with subspp. aurantiaca and cruciformis, and hybridizes with Chylismia brevipes subsp. brevipes.