Small perennial herb forming small to large and extensive loose mats; stems prostrate, rooting at nodes, with very slightly ascending tips, much-branched. Lvs connate at base, 1.3-5 × 0.4-1 mm, 0.2-0.4 mm thick, lanceolate, linear-lanceolate, or elliptic-lanceolate, flattened or slightly concave above, convex beneath; apex sharply acute, shortly acuminate or apiculate. Fls solitary in lf axils, star-like, 4-merous, 1.8-2.5 mm diam.; pedicels 0.5-1 mm long, scarcely elongating at fruiting. Calyx lobes 0.8-1 × 0.4-0.6 mm, triangular or triangular-ovate, acute. Petals 1-1.3 × 0.5-0.7 mm, ovate or triangular-ovate, white or pink-flushed, acute or sharply acute, slightly > calyx. Scales c. 0.5 mm long, ± cuneate. Follicles smooth. Seed c. 0.5 mm long.
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