Oenothera scapoidea Torrey &A. Gray var. tortilis Jepson, Man. Fl. Pl. Calif., 687. 1925; Camissonia walkeri (A. Nelson) P. H. Raven subsp. tortilis (Jepson) P. H. Raven; C. walkeri var. tortilis (Jepson) S. L. Welsh; O. walkeri (A. Nelson) P. H. Raven subsp. tortilis (Jepson) P. H. Raven

Leaves primarily basal, forming conspicuous rosette, cauline reduced or absent; blade usually pinnately lobed, rarely bipinnately, lateral lobes usually well developed. Flowers: floral tube 1–1.5 mm; sepals 1.5–5 mm; petals 2.8–6 mm; anthers 1–2 mm, glabrous or sparsely ciliate; style 4–6 mm. Capsules: pedicel 5–30 mm. 2n = 14.

Flowering Apr–Jun. Colonial in rocky debris near cliffs, along ephemeral streams, on limestone; 600–1900 m; Calif., Nev., Utah.

Subspecies tortilis is known from Millard and Washington counties, Utah, west to southern Elko and Mineral counties, Nevada, southwest to Inyo and northeastern San Bernardino counties, California, eastward to Clark County, Nevada.