Annuals 4-6 cm tall, almost glabrous. Stems prostrate to ascending, slender, 2 or 3 × dichotomously branched from base, glabrous. Basal leaves with petiole 1-2 mm; leaf blade involucriform, ovate-elliptic to ovate-orbicular, 1-1.7 cm × 6-8 mm, margin indistinct and membranous, apex obtuse to rounded with a recurved tip; veins 3-5, distinct, slender. Stem leaves 3-6 pairs, spreading, widely spaced; petiole tube 1-1.5 mm; leaf blade spatulate to obovate, 5-10 × 2-7 mm, much shorter than internodes, margin indistinct and membranous, apex obtuse to rounded with a recurved tip, veins 1-3, distinct, and slender. Flowers few. Pedicel 4-6 mm, papillate. Calyx narrowly obconic, 8-9 mm; lobes triangular, 1.5-2 mm, margin narrowly membranous, apex acute, midvein distinct. Corolla clear pale blue, usually with pale yellow-white base, funnelform, 1.2-1.6(-1.9) cm; lobes ovate, 1.5-3 mm, margin entire, apex obtuse; plicae ovate, 1-2 mm, margin entire, apex obtuse. Stamens inserted just below middle of corolla tube, unequal, generally 3 longer and 5-6 mm, 2 shorter and 3-4 mm; filaments linear; anthers ellipsoid, 0.8-1 mm. Style 1.5-2 mm; stigma lobes narrowly oblong. Capsules narrowly obovoid to obovoid, 5-6.5 mm; gynophore to 3 cm, stout. Seeds brown, triquetrous-ellipsoid, 1.2-1.5 mm. Fl. and fr. May-Sep.

* River banks, valleys, hillsides, grasslands; 2400-4600 m. N Sichuan.