Annuals 5-40 cm tall. Roots yellow, stout. Stems erect, subquadrangular, narrowly winged on angles, branched. Basal and lower stem leaves subsessile, lanceolate, rarely oblanceolate, 7-12 × 2-3.5 mm, base narrowed, apex obtuse, midvein distinct. Middle to upper stem leaves sessile, linear to linear-lanceolate, 0.3-1.7 cm × 0.5-3 mm, both ends attenuate, midvein distinct. Inflorescences panicles of cymes, many flowered, spreading. Flowers 5merous. Pedicel erect, 6-13 mm, filiform. Calyx tube 1-1.5 mm; lobes linear, 4-7 mm, apex acuminate, midvein distinct. Corolla pale blue, 1-1.2 cm in diam., tube 1-1.5 mm; lobes elliptic, 7-12 mm, apex acuminate. Nectaries 2 per corolla lobe, triangular-lamellate, laciniate. Filaments 5-6 mm; anthers oblong, 1.5-2 mm. Ovary narrowly ellipsoid. Style indistinct; stigma lobes capitate. Fl. Sep-Oct.
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