Description from Flora of China
Cyananthus barbatus Franchet (1885), not Edgeworth (1846); C. microrhombeus C. Y. Wu; C. microrhombeus var. leiocalyx C. Y. Wu.
Caudexes branched; scales deltoid-lanceolate, ca. 2 × 1 mm. Stems caespitose, prostrate or ascending, slender, 7-20 cm, branched, white- or yellowish hispid, more densely so toward apex. Leaves alternate; blade suborbicular, ovate, or deltoid, 2-5 × 1-7 mm, abaxially silvery sericeous, adaxially hispidulous, base cuneate, obtuse, rounded, or truncate, margin slightly recurved, entire, sinuous, or crenulate, apex rounded or obtuse; petiole 1-3 mm, white hispid. Flowers solitary, terminal on main stems and some branches, each subtended by a whorl-like aggregation of 3-5 leaves; pedicels 3-9 mm. Calyx brown hirsute or glabrescent; tube cylindrical at anthesis, 4.5-9 × 3.5-7 mm, base rounded or truncate, becoming enlarged in fruit; lobes narrowly triangular, 1.5-4 × 1-3 mm, both sides hirsute. Corolla blue, tubular-campanulate, 1.8-3.4 cm, outside glabrous, inside densely villous at throat; lobes linear-oblong, 6-12 mm. Ovary 5-locular, subequal to calyx in length at anthesis; style extending to corolla throat; stigma 5-fid. Capsules conical, longer than calyx. Seeds brown, oblong or ellipsoid, ca. 1.8 × 0.3 mm. Fl. Sep.
● Grassy calcareous slopes, forests, forest margins; 1900-4000 m. SW Sichuan, N Yunnan.