Annuals or biennials 10-45 cm tall. Stems erect, subquadrangular, branched from base. Leaves sessile, ovate-lanceolate to ovate, to 4.5 × 2 cm, base obtuse to rounded, margin usually revolute, apex acute, veins distinct. Cymes many flowered, crowded, each cyme subtended by 2 large ovate-lanceolate bracts. Flowers 5merous, variable in size, terminal ones 2-3 × larger than others. Calyx tube 1.5-7(-9) mm, membranous; lobes linear to linear-elliptic, 2-10 × ca. 1 mm, unequal, sinus between lobes rounded, margin scabrous, apex acute and long apiculate, midvein distinct. Corolla pale blue, with dark blue veins, tubular to campanulate-tubular, 0.7-2 cm; lobes elliptic-triangular to elliptic, 3-7 mm, apex obtuse and mucronate. Nectaries 10, green, oblong. Stamens inserted at basal part of corolla tube; filaments white, ca. 7 mm, base decurrent into narrow wings of corolla tube; anthers yellow, ellipsoid, ca. 1.2 mm. Style linear; stigma lobes suborbicular. Gynophore 1.8-2.2 cm. Seeds light brown, subglobose, ca. 0.8 mm in diam.; seed coat reticulate. Fl. and fr. Jun-Jul.
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