Annuals 6-20 cm tall. Stems erect, angular, branched apically; branches slender, glabrous. Leaves sessile; lower to middle stem leaves ovate-lanceolate, 5-10 × 2-3.5 mm, base obtuse, apex acute, midvein distinct abaxially; upper leaves linear-lanceolate, 3-5 × ca. 1 mm, apex acuminate. Inflorescences racemelike, usually in many-flowered panicles. Flowers (4-or) 5merous. Pedicel spreading to erect, 0.6-1.5 cm, slender, angular, glabrous. Calyx tube 1.5-2 mm; lobes linear-lanceolate to narrowly ovate, 3.5-4.5 mm, base obtuse, apex acuminate, midvein distinct. Corolla white, 4-5.5 mm in diam.; tube 1-1.5 mm; lobes lanceolate to narrowly ovate, 5-6 × ca. 2 mm, apex acuminate. Nectaries yellow, naked. Filaments ca. 3 mm; anthers yellow, ellipsoid, ca. 1.2 mm. Ovary ovoid-ellipsoid, apex acuminate. Stigma lobes decurrent to apical part of ovary. Capsules ovoid-ellipsoid, ca. 7.5 mm. Seeds brown, subglobose, ca. 0.2 mm in diam. Fl. and fr. Aug-Sep.
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