Annuals with erect branches 20-60 mm high, rarely much less, glabrous, sparsely branched and with lateral branches much shorter than central one. Leaves sessile, lanceolate to narrowly triangular, 4-8(-12) x 4 mm, tapering into a stiff terminal point or seta, glabrous, with horny-papillose margin, dorsiventrally flattened or sometimes convex below, slightly fleshy and leathery, green to brown. Inflorescence a thyrse, usually with many sessile dichasia, rarely reduced to one, with more or less sessile, 5-merous flowers. Calyx: lobes triangular, 2-3 mm long, sharply acute and/or with terminal seta, papillose-scabrid, somewhat fleshy, green. Corolla cup-shaped to tubular, scarcely fused basally, white turning brown; lobes triangular-lanceolate, acute and more or less keeled towards apex, erect with slightly recurved apices. Stamens with yellow anthers. Squamae broadly oblong-cuneate, 0.4-0.7 x 0.3-0.5 mm, truncate or slightly emarginate, abruptly constricted into a thin stalk, membranous, pale yellow. Seeds 10-14, released by apical pore and basal circumscissile split of pericarp.
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Erect, subglabrous or minutely hairy annual to 6 cm. Leaves opposite, ovate-triangular, margins papillate-ciliolate. Flowers in sessile, axillary cymes, star-shaped, white or pinkish, petals 1.0-1.5 mm long, papillose, sepals 2-3 mm long, carpels tuberculate.