Annuals 15-40 cm tall. Roots yellow, fibrous. Stems erect, subquadrangular, branched. Basal leaves withered at anthesis. Stem leaves sessile, oblanceolate to oblong, 1-2.5 cm × 3-6 mm, base narrowed, margin slightly revolute, apex acute; veins 3, abaxially prominent. Inflorescences a narrow panicle, with many ± fascicled flowers. Flowers 5merous. Pedicel erect, 3-5 mm, slender, subquadrangular. Calyx tube 1-1.5 mm; lobes lanceolate to narrowly oblong, 4-5 mm, margin ciliolate and slightly revolute, apex acute and apiculate, midvein distinct. Corolla pale blue, tube 1-1.5 mm; lobes lanceolate, 5-7 mm, apex acuminate and apiculate. Nectaries 2 per corolla lobe, radially elongated, with a narrow scale and raised margin with many long fimbriae. Filaments 3-5 mm; anthers ellipsoid, 1-1.5 mm. Style indistinct; stigma lobes capitate. Capsules ovoid-ellipsoid, 7-10 mm. Seeds pale yellow, subglobose, 0.5-0.7 mm in diam., almost smooth. Fl. and fr. Jul-Nov.
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