Leaves 1-2; blade 5-18 cm × 0.5-4 mm. Scape 2-6.5 cm. Umbel 6-20-flowered. Flowers 4-7(-9) mm; tepals white with prominent, dark purplish midveins, oblong-elliptic, apex obtuse; pedicel 2-7 (-11) mm. 2n = 14. Flowering May--Jun. Granitic sands; 1500--3500 m; Calif., Nev.