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Matted perennial, prostrate and rooting at nodes or with erect stems to 15 cm high. Stems glabrous or with fine close hairs in lines decurrent from leaf bases. Leaves crowded, usually opposite, alternate in flowering region, narrowly elliptic or elliptic, c. 1–2 cm long, usually shallowly toothed, acute at the apex, attenuate at base. Flowers with hypanthium glabrous. Petals 3–5 mm long, white. Capsule c. 1–2 cm long, glabrous; pedicel 1–4 cm long. Seeds obovoid, 0.8–0.9 mm long, comose.
Herb, creeping and rooting at nodes, often densely matted with crowded lvs, or with erect reddish stems to 15 cm tall. Stems glabrous or with lines of fine strigillose hairs decurrent from margins of petioles. Lamina of lf narrowly elliptic or elliptic, 6-20 × 2-5.5 mm. Floral tube 0.5-1.1 mm deep, glabrous. Petals white, 3.3-5 × 3.6 mm. Capsule glabrous, 0.8-2.2 cm long; fruiting pedicel (0.2)-1-4 cm long.
