Annuals 4-30 cm tall. Stems ascending to erect, 2-4 × dichotomously branched from base, glabrous. Basal leaves withered at anthesis; petiole 1-2 mm; leaf blade ovate-elliptic to ovate, 0.9-2 cm × 4-10 mm, abaxially glabrous, adaxially densely and minutely papillate, apex acute; veins 1-3, distinct, slender. Stem leaves spreading; petiole tube 1-1.5 mm, papillate on margin and abaxially; leaf blade lanceolate, narrowly elliptic, or ovate-triangular, 6-8 × 2.5-3.5 mm, much shorter than internodes, abaxially glabrous, adaxially densely and minutely papillate, base rounded to cordate, margin ciliolate, apex acuminate to acute; veins 1-3, distinct, slender. Flowers few to many. Pedicel 3-12 mm, glabrous. Calyx obconic, 4.5-7 mm; lobes filiform to filiform-subulate, 1.5-3 mm, base 1-1.5 mm wide, apex acuminate, midvein prominent. Corolla pale blue, outside with blue-gray stripes, obconic, (0.8-)1-1.4 cm; lobes ovate, 2.5-3.5 mm, margin entire or indistinctly denticulate, apex obtuse; plicae ovate, 2-2.5 mm, fringed usually with 15-20 filaments. Stamens inserted just below middle of corolla tube, equal; filaments 3-4 mm; anthers ellipsoid, 0.6-1 mm. Style 0.7-1.2 mm; stigma lobes oblong. Capsules narrowly obovoid to obovoid, 4-5 mm; gynophore to 8 mm. Seeds light brown, ellipsoid, 1.3-1.5 mm. Fl. and fr. May-Aug.
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