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Herb, annual (or rarely biennial), with slender tap root, glabrous. Stems prostrate to ascending or erect, 5–15 (–25) cm long. Leaves sessile to petiolate, obovate to oblong-spathulate, obtuse; margin entire, 4–18 mm long, 3–10 mm wide; petiole to nearly as long as lamina; stipules glabrous, deltoid, 1–2 mm long. Inflorescence much-branched; bracts glabrous, deltoid, 1–2 mm long. Flowers 3–4 mm diam.; pedicels 0.5–4 mm long. Calyx glabrous. Sepals 5, mucronate, 2–3 mm long, with a broad, green midrib and membranous margins. Petals 5, less than half sepal length, white, entire or emarginate, c. 1 mm long. Stamens 3–5. Capsule ovoid, c. 2 mm long. Seeds 0.4–0.6 mm long, pale brown, papillose-tuberculate.
Prostrate, annual or perennial herb, up to 0.2 m high. Leaves in whorls of 4, obovate. Inflorescences crowded in many-flowered cymes. Flowers white, with 5 small, entire, hyaline petals, shorter than sepals. Flowering time Sept.-Dec. Fruit a capsule, dehiscent almost to base into 3 spirally twisting valves. Seeds many, ovoid or lenticular.
Annual herb, up to 0.2 m high; glabrous. Stems procumbent or decumbent. Leaves with blade ovate, mostly in whorls of 4, green. Flowers: in clusters; inflorescence lax, spreading, much branched; corolla with petals shorter than sepals, white; Sep.-Dec. Fruit a 3-valved capsule.
Prostrate, glabrous or shortly hairy annual or rarely perennial, up to 200 mm tall, with much-branched stems and without a woody rootstock. Leaves in whorls of 4, ± obovate. Flowers congested in small, branched cymes, petals white, shallowly notched.
Prostrate herb or suberect annual, up to 200 mm tall. Leaves green, mostly in whorls of 4. Inflorescence lax, spreading, much\branched. Flowers green and white.
Prostrate annual or perennial to 20 cm. Leaves in whorls of 4, obovate. Flowers congested in branched cymes, white, petals emarginate.
