Stems rooting at older nodes, prostrate, mat-forming, glabrous. Leaves crowded on short shoots; blade gray-green, white-mar-gined, linear, 3-angled in cross section, 2-3 × 0.5-0.6 cm, apex acute. Inflorescences axillary or terminal cymes; pedicel to 20 mm. Flowers 3-7(-16), 15-22 mm diam.; calyx lobes keeled abaxially, 3-4 mm, apex obtuse, 3 lobes with papery margins; petals white, 8-10 mm; nectary glands distinct; stamens distinct, conic around stigmas; filament bases usually hairy; ovules 100; stigmas 5, caudate, papillate adaxially. Capsules 5-loculed. Seeds: mature seeds not observed. 2n = 18.

Flowering late spring-fall. Margins of coastal wetlands, stabilized dunes; 0-30 m; introduced; Calif. (including San Nicholas Island); South Africa.

This species is known in the nursery trade in California as Delosperma `Alba.´