Allium unifolium, the one-leaf onion, is a species of wild onion. It is native to the coastal mountain ranges of California and Oregon, from San Luis Obispo County north to Yamhill County. It grows on clay soils including serpentine, at elevations up to 1100 m.
Allium unifolium, despite its name, usually has 2-3 flat leaves up to 50 cm long. Bulbs, though, are usually solitary, egg-shaped, up to 2 cm long, often formed at the end of rhizomes spreading out from the parent plant. Scapes are round in cross-section, up to 80 cm tall. Flowers are up to 15 mm across; tepals usually pink but occasionally white; anthers yellow or purple.
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