Annuals 3-12 cm tall. Stems ascending to erect, branched from base, glabrous. Petiole tube 3-4 mm; leaf blade obovate, 4.5-9 × 1.2-3.5 mm, shorter than internodes, margin narrowly membranous and smooth or ciliolate, apex rounded and mucronate with a recurved tip, midvein abaxially distinct. Pedicel 1-2.5 cm, exserted from upper leaves, glabrous. Calyx tubular to narrowly obconic, 1-1.2 cm; lobes triangular, 2.5-3 mm, margin narrowly membranous and smooth, apex acute, midvein strongly keeled and decurrent into conspicuous wings of calyx tube. Corolla dark blue to blue-purple, with greenish yellow base, tubular to narrowly funnelform, 2-2.6 cm, 6-8 mm in diam. at throat; lobes ovate-elliptic to ovate, 4-5 mm, margin entire, apex obtuse; plicae oblong, 2.5-3.5 mm, margin serrulate, apex truncate. Stamens inserted at middle of corolla tube, equal; filaments 4-5 mm; anthers narrowly ellipsoid, 1.5-1.7 mm. Style 1.5-2 mm; stigma lobes semiorbicular. Capsules narrowly ellipsoid, 8-10 mm; gynophore to 7 mm. Seeds brown, ellipsoid, 1-1.2 mm, sometimes winged when young. Fl. and fr. Jun-Sep.

* River banks, grassland slopes, alpine meadows; 2200-5000 m. Gansu, Qinghai, Shaanxi, N Sichuan.