Annuals 8-15 cm tall. Stems erect, simple or few branched from middle, glabrous. Basal leaves with petiole 2-3 mm, adaxially papillate; leaf blade ovate-elliptic, ovate, or ovate-orbicular, 1-2.5 cm × 4-10 mm, margin ciliolate, apex obtuse to rounded; veins 1-3, distinct, slender. Stem leaves widely spaced; petiole tube 1-1.5 mm, adaxially papillate; leaf blade lanceolate, ovate-elliptic, ovate, or obovate-orbicular, 0.4-2.2 cm × 2-7 mm, shorter than internodes, margin ciliolate, apex obtuse, veins 1-3. Flowers 1 to few. Pedicel (0.3-)1-1.5 cm, glabrous. Calyx narrowly obconic; lobes filiform to filiform-subulate, margin smooth, apex acuminate, midvein distinct. Corolla purple, 1.5-6 cm; tube outside usually with blackish short lines and spots, narrowly obconic; lobes ovate, margin entire, apex obtuse; plicae ovate, margin entire, erose, or 2cleft. Stamens inserted at middle of corolla tube, equal; filaments 0.7-1.5 cm; anthers narrowly ellipsoid, 2.5-4 mm. Style 1.5-2.5 mm; stigma lobes linear. Capsules narrowly obovoid, 7-9 mm; gynophore to 4(-5.5) cm. Seeds brown, ellipsoid, 1-1.3 mm. Fl. and fr. Mar-Oct.
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