Leafl. W. Bot. 2: 128. 1938.
Bulbs ovoid, 5–7 cm, tunic reddish to brown, membranous, outer scales with few delicate fibers. Leaves 1–3 dm × 4–12 mm, margins strongly undulate. Panicles 3–10 dm, branches ascending. Flowers vespertine, closed by following morning; tepals recurved at anthesis, white with purplish midvein, linear, 1.5–3 cm; stamens typically slightly shorter than tepals; anthers yellow, 3 mm; pollen yellow; style often exserted after anthesis, 12–28 mm, equal to or slightly longer than tepals; pedicel stout, 2–5 mm, much shorter than perianth. Capsules 5–8 mm.
Phenology: Flowering May–Jun.
Habitat: Among rocks (usually serpentinite) on open brushy or wooded hills
Elevation: 300–500 m
Of conservation concern.
Chlorogalum grandiflorum is considered by the California Native Plant Society to be endangered in a portion of its range. It is often confused with C. pomeridianum var. minus because of bulb characters, but it can be distinguished by its short, stout pedicels and larger flowers.