Oenothera multijuga S. Watson, Amer. Naturalist 7: 300. 1873; Camissonia multijuga (S. Watson) P. H. Raven; Chylisma hirta A. Nelson; C. parviflora (S. Watson) Rydberg; C. venosa A. Nelson & P. B. Kennedy; O. brevipes A. Gray var. multijuga (S. Watson) Jepson; O. brevipes var. parviflora S. Watson; O. multijuga var. parviflora (S. Watson) Munz; O. phlebophylla Tidestrom; O. watsonii Tidestrom

Herbs annual or biennial, villous, at least proximally, glabrous or even glaucous distally, rarely glandular puberulent. Stems virgate with numerous divergent branches, 20–150 cm. Leaves primarily in well-developed basal rosette, cauline reduced or absent, 6–30 × 1.4–6.5 cm; petiole 0.3–6 cm; blade pinnately or bipinnately lobed, terminal lobe ovate to elliptic, 2.5–6.5 × 1.5–3 cm, margins irregularly serrate, dark brown oil cells prominently lining veins abaxially. Racemes erect to nodding, elongating in bud. Flowers opening at sunrise; buds individually reflexed, with apical or slightly subapical free tips less than 1 mm; floral tube 1–3 mm, glabrous or villous inside proximally; sepals 3–8 mm; petals usually bright yellow, rarely cream, fading yellow to lavender, 4–9 mm; stamens unequal, filaments of antisepalous stamens 2.5–4 mm, those of antipetalous ones 1.3–3 mm, anthers 2–4 mm, ciliate; style 7–11 mm, stigma exserted beyond anthers at anthesis. Capsules usually spreading, rarely slightly reflexed, oblong-cylindrical, 10–52 mm; pedicel 7–20 mm. Seeds 1–1.3 mm. 2n = 14.

Flowering Mar–Jun(–Sep). Forming colonies on rocky slopes and banks of eroded sedimentaries, on gypsum or limestone, on conglomerates, often with Juniperus and Pinus edulis, with Encelia farinosa and Larrea; 300–1100 m; Ariz., Nev., Utah.

Chylismia multijuga is known from Washington County, Utah, and southern Lincoln County, Nevada, to northern Mohave County, Arizona. P. H. Raven (1962, 1969) determined this species to be self-incompatible. It hybridizes with C. brevipes subspp. brevipes and pallidula.