Suppl. Calif. Fl., 174. 1968.
Plants bulbose; bulb coat membranous. Stems usually branching, 1–6 dm. Leaves: basal withering, 1–2 dm; blade linear. Inflorescences subumbellate, 1–3-flowered; bracts 2–8 cm. Flowers erect; perianth open, campanulate; sepals with dark red proximal blotch surrounding gland and extending to base, lanceolate, 2–3 cm, apex recurved; petals white or yellowish, often pink abaxially, with dark red blotch surrounding gland, often with small red spot immediately above gland, obovate to cuneate, 3–5 cm, with scattered hairs proximally; glands suprabasal, ± square, not depressed, covered with short hairs; filaments usually equaling anthers; anthers linear-lanceolate to oblong. Capsules erect, linear, angled, 5–6 cm. Seeds light beige, flat, 5–6 mm. 2n = 14.
Phenology: Flowering late spring–mid summer.
Habitat: Sand (often granitic), grasslands to pine forests
Elevation: 0–1100 m
Calochortus simulans is restricted to central San Luis Obispo County.