5. Chylismia walkeri A. Nelson, Bot. Gaz. 56: 66. 1913. (as Chylisma).
[E]
Camissonia walkeri (A. Nelson) P. H. Raven; Oenothera walkeri (A. Nelson) P. H. Raven
Herbs annual or short-lived perennial, villous, usually densely so proximally, less dense to glabrate distally, sometimes hairs somewhat appressed and shorter on leaves, also sometimes glandular puberulent on distal parts. Stems slender, unbranched or branched from base, 10–60 cm. Leaves in basal rosette and/or cauline, often purple-dotted, 2–22 × 0.4–3.5 cm; petiole 0.4–8 cm; blade pinnately lobed, sometimes lateral lobes greatly reduced or absent and blade reduced to terminal lobe only, terminal lobe oblong or cordate to ovate, 1–5 × 0.5–3.2 cm, margins serrate, brown oil cells prominently lining veins abaxially. Racemes erect, elongating after anthesis. Flowers opening at sunrise; buds individually reflexed, with apical free tips less than 1 mm; floral tube 0.5–1.5 mm, glabrous or sparsely villous inside; sepals 1.5–5 mm; petals bright yellow, fading pale orange or lavender, 1–6 mm; stamens unequal, filaments of antisepalous stamens 1–3 mm, those of antipetalous ones 0.3–2 mm, anthers 0.5–2 mm, glabrous or sparsely ciliate; style 1.5–6 mm, stigma surrounded by anthers at anthesis. Capsules spreading or ascending, oblong-cylindrical, 11–45 mm; pedicel 5–30 mm. Seeds 0.6–1.2 mm.
Subspecies 2 (2 in the flora): sw United States.
P. H. Raven (1962, 1969) determined this species to be self-incompatible and primarily autogamous.
