Scape 10-20 cm × 0.5-1 mm. Umbel 6-35-flowered. Flowers: tepals dark reddish purple, apex ± spreading or recurved at tip; ovary crest process margins denticulate to laciniate. 2n = 14.

Flowering Apr--Jun. Open clay (including serpentine) slopes and flats; 300--2700 m; Calif.; Mexico (Baja California).