Annuals 5-30 cm tall. Stems erect, subquadrangular, branched from base. Basal leaves few; leaf blade oblong to oblong-spatulate, 1.5-2.2 × 0.5-0.7 cm, base cuneate, apex rounded, midvein distinct. Stem leaves sessile, ovate-lanceolate, 0.6-2.8 cm × 3-10 mm, base obtuse to rounded and subamplexicaul, apex acute to obtuse, veins 1-3. Flowers in terminal and axillary cymes or solitary. Pedicel erect, to 4 cm, subquadrangular. Calyx spreading, slightly unequal, 6-8 mm; lobes narrowly elliptic, lanceolate, or ovate-triangular, margin scabrous to ciliolate, apex acute, veins 1-3. Corolla pale blue, with dark blue veins, tubular to broadly tubular, (0.9-)1.5-2(-2.3) cm; lobes erect, ovate-elliptic, elliptic-triangular, or ovate-triangular, 5-6 mm, scale 1, apex acute. Nectaries 10. Stamens inserted just above middle of corolla tube; filaments ca. 3 mm, base decurrent into wings of corolla tube; anthers yellow, ellipsoid, ca. 1 mm. Style indistinct; stigma lobes suborbicular. Capsules ovoid-ellipsoid, 2-2.7 cm. Seeds light brown, subglobose, 0.8-1 mm in diam.; seed coat smooth. Fl. and fr. Jul-Nov.
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