Annuals 2-10 cm tall. Stems prostrate to ascending, branched from base, glabrous. Basal leaves withered at anthesis; petiole 1-2 mm; leaf blade ovate, 5-7 × 3-4 mm, margin narrowly and indistinctly membranous, apex obtuse, veins 1-3, distinct, and slender. Stem leaves 3-5 pairs, widely spaced; petiole tube 1-2 mm; leaf blade elliptic, rarely ovate toward base of stem, 5-9 × 1-2.5 mm, much shorter than internodes, margin narrowly and indistinctly membranous, apex obtuse, veins 1-3, distinct, and slender. Flowers few. Pedicel 0.5-1.5 cm, much exserted from uppermost leaves, glabrous. Calyx campanulate, 5.5-6.5 mm; tube herbaceous, with 5 membranous longitudinal veins; lobes linear-lanceolate to lanceolate, 2.5-3.5 mm, margin narrowly membranous, apex acuminate, midvein prominent. Corolla open, white or pale blue to blue, inside with or without dark blue stripes but with pale yellow spots in throat, campanulate, 0.9-1.2 cm; lobes elliptic to ovate-elliptic, 2-3(-4) mm, margin entire, apex obtuse; plicae oblong, 1.5-2(-3) mm, apex deeply 2cleft with both segments entire and acute. Stamens inserted at basal part of corolla tube, equal; filaments 4-5 mm; anthers ellipsoid, 0.6-0.8 mm. Style 1.5-2 mm; stigma lobes linear. Capsules narrowly obovoid, 4-5 mm; gynophore to 1 cm, stout. Seeds light brown, ellipsoid, 0.9-1.1 mm. Fl. and fr. Jun-Aug.
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