Annuals 1.5-8 cm tall. Stems ascending to erect, weak, 2 or 3 × dichotomously branched from base or rarely simple, glabrous. Basal leaves withered at anthesis; petiole 1-2 mm; leaf blade ovate-elliptic, 5-9 × 2-4 mm, abaxially glabrous, adaxially densely and minutely papillate, apex obtuse, midvein distinct. Stem leaves spreading; petiole tube 0.5-0.7 mm; leaf blade ovate, 3-5 × 2-3 mm, much shorter than internodes, abaxially glabrous, adaxially densely and minutely papillate, base rounded, apex acute, midvein distinct. Flowers 1 or few. Pedicel 3-8 mm, slender, glabrous. Calyx tubular to narrowly obconic, 2-3 mm; lobes filiform to filiform-subulate, 1-1.5 mm, base 0.5-1 mm wide, apex acuminate. Corolla outside pale blue, inside white, narrowly obconic, 4-6 mm; lobes ovate, 1.5-2 mm, margin entire, apex obtuse; plicae ovate, 1-1.5 mm, margin entire, apex acute. Stamens inserted at middle of corolla tube, equal; filaments 1-1.2 mm; anthers ellipsoid, 0.5-0.7 mm. Style 0.8-1 mm; stigma lobes linear. Capsules obovoid, 2-3 mm; gynophore 1-2 mm. Fl. and fr. Aug.
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