Herbage glabrous. Stems decumbent. Flowers cup-shaped; sepals not accrescent, lanceolate to lanceolate-ovate, 7.5-8 mm, abaxially and adaxially glabrous; petals oblong, 7.5-8.5 mm, apex obtuse (not emarginate); filaments 4.2-4.7 mm; anthers ± 1 mm, usually dehiscing introrsely; style 3-3.5 mm. Nutlets 3-5, tubercles broad-based, platelike cones.

Flowering Mar-May. Edges of deep vernal pools on lava flows; of conservation concern; 600 m; Oreg.

Subspecies pumila is found only on the summits of Upper Table Rock and Lower Table Rock, in Jackson County.