Leaf blade subterete to ± terete, arcuate, 1–2 times scape, 1–2 mm wide. Scape 10–20 cm. Umbel compact, 5–25-flowered; spathe bracts 2, apex acuminate. Flowers (6–)7–9 mm; tepals white with deep pink or purple midveins; pedicel 5–15 mm. 2n = 14.

Flowering Apr--Jun. Apparently restricted to serpentine clays on ridges and peaks; 300--1000 m; Calif.

Allium lacunosum var. lacunosum is known only from the central and south Coast Ranges, and on Santa Rosa and Santa Cruz islands.