Annuals 3-32 cm tall. Stems ascending to erect, angular, much branched from base, glabrous. Leaves sessile, lanceolate to elliptic, 0.7-3 cm × 2-5 mm, base narrowed, apex acuminate and mucronate, midvein abaxially distinct. Inflorescences racemelike, usually in many-flowered panicles. Flowers 5merous. Pedicel spreading to erect, 0.5-3.5 cm, slender, angular, glabrous. Calyx tube 1-1.5 mm; lobes linear to linear-lanceolate, 4-8 mm, base obtuse, apex acuminate, midvein distinct. Corolla white tinged blue or pale blue, tube 1-1.5 mm; lobes ± elliptic, 0.7-1.6 cm, apex acuminate. Nectaries connate at base into a tube pointed outward, apex lamellate, margin lobed. Filaments 6-7 mm; anthers blue, ellipsoid, 3-4 mm. Ovary ensiform to obovoid-ellipsoid, 5-11 mm, apex triangular acute. Stigma lobes triangular, decurrent to apical part of ovary. Capsules ellipsoid, as long as persistent corolla. Seeds brown, globose, ca. 0.5 mm in diam. Fl. and fr. Aug-Oct.
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