Herbs, annual. Taproots slender. Stems ascending to decumbent or sprawling, simple or branched, terete or angled. Leaves connate proximally, sessile; blade 1-veined, lanceolate or rarely elliptic, not succulent, apex acute. Inflorescences axillary and terminal, compound cymes; bracts paired, foliaceous, smaller. Pedicels reflexed in fruit. Flowers: perianth and androecium weakly perigynous; hypanthium minimal; sepals 5, distinct, green, lanceolate to elliptic or ovate, 4-5 mm, herbaceous, margins white, scarious, apex somewhat acute, not hooded; petals 5, white or pink, not clawed, blade apex entire or emarginate; nectaries at base of filaments opposite sepals; stamens 10, arising from nectariferous disc at ovary base; filaments distinct nearly to base; staminodes absent; styles 2, clavate, 3.5-4 mm, glabrous proximally; stigmas 2, subterminal, minutely roughened to papillate (50×). Capsules globose-ovoid, opening by 2 straight valves; carpophore absent. Seeds 1-2(-4), dark brown, reniform, laterally compressed, tuberculate, marginal wing absent, appendage absent. x = 17.
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Herbs annual. Stems ascending or diffuse, branched. Leaves linear-lanceolate or lanceolate; stipules absent. Inflorescence a panicle of cymes; bracts immediately subtending calyx absent. Sepals 5. Petals 5, white or reddish, margin entire or emarginate. Stamens (7--)10(--14). Ovary 1-loculed; ovules few; styles 2(or 3). Capsule globose, 2(or 3)-valved. Seeds 1 or 2(or 3), small, testa thick, tuberculate; embryo curved.
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