Stems 3-17 cm, mostly glabrous. Leaves pairs unequal; stipules 0.1-0.4 mm; blade 3-20 mm. Inflores-cences 20-60+-flowered. Flow-ers: perianth 2.5-3 mm; hypanth-ium green, becoming brown and hard, 10-ribbed distally; sepals erect to spreading, concave, cen-tral portion green, fleshy, white, scarious portion forming an ovate to orbiculate apex, 1-1.3+ mm wide, becoming deciduous with age; staminodes ca. 0.5 mm. Seeds 0.9-1.1 mm.

Flowering spring. Dry, sandy areas, sand dunes, desert washes; 50-700 m; Ariz., Calif.; Mexico.