Annual, succulent herb, erect wiry branches, ± 0.1 m high. Leaves sessile, lanceolate to elliptic, 3-7 x 2-4 mm, obtuse, glabrous, slightly fleshy, green to brown. Inflorescence a thyrse, one dichasium in axils of leaves; flowers sessile, 5-merous. Calyx shorter than petals, very fleshy. Corolla cup-shaped, scarcely fused at base, white; lobes oblanceolate, 2-3 mm long, acute, erect, recurved at apex. Flowering time Aug.-Nov.
Like C. grammanthoides but flowers smaller, petals 2-3 mm long and ± contorted and stylar horn very short, ± a quarter as long as ovary.