Small annual or sometimes perennial herb forming small to large moss-like mats; stems ± decumbent, rooting at nodes, freely branching from base, ascending to c. 3 cm towards tips. Lvs connate at base, 1-2.4 × 0.6-0.7 mm, 0.3-0.35 mm thick, ± triangular-lanceolate, flattened above, strongly convex and somewhat keeled below; apex acute or apiculate. Fls solitary in upper lf axils, star-like, 4-merous, 3.5-4 mm diam.; pedicels to c. 2 mm long, elongating to 3-(4) mm at fruiting. Calyx lobes 0.5-0.8 × 0.5-0.6 mm, triangular, acute to apiculate. Petals 1.6-1.8 × c. 1.2 mm, broadly elliptic-ovate, white, sometimes pink in centre, rounded, much > calyx. Scales c. 0.7 mm long, oblanceolate. Follicles smooth. Seed c. 0.5 mm long.
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