Proc. Amer. Acad. Arts 7: 331. 1868.
Stems 3–17 cm, mostly glabrous. Leaves pairs unequal; stipules 0.1–0.4 mm; blade 3–20 mm. Inflorescences 20–60+-flowered. Flowers: perianth 2.5–3 mm; hypanthium green, becoming brown and hard, 10-ribbed distally; sepals erect to spreading, concave, central 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.
Phenology: Flowering spring.
Habitat: Dry, sandy areas, sand dunes, desert washes
Elevation: 50-700 m
Ariz., Calif., Mexico