Glabrous annual; stems creeping, pinkish, rooting at nodes, often mat-forming. Lvs opposite, shortly petiolate. Lamina 3-12 × 2-8 mm, obovate or suborbicular, entire, somewhat succulent; base attenuate; apex rounded. Fls solitary, ± subsessile, monomorphic. Bracteoles > pedicel. Calyx 1.2-1.5 mm long; tube broad-campanulate; teeth membranous and pinkish except for green margins and mid-vein, acuminate with dark apex; epicalyx segments subulate, green or pink, = or > calyx teeth. Petals 0 (possibly sometimes minute). Stamens 6, always included. Style always very short. Capsule included, c. 2 mm diam., subglobose, membranous, often pinkish. Seed 0.5-0.6 mm long, flat on one face, convex on the other.