Description from Flora of China
Cyananthus argenteus C. Marquand; C. obtusilobus C. Marquand.
Caudexes robust, ± lignified, branched, with some scales toward apex; scales ovate, ca. 2 mm. Stems caespitose, erect, 4-22 cm tall, lignified toward base, densely gray-white lanate; branches very short. Leaves alternate; blade elliptic or ovate, 5-15 × 2-8 mm, abaxially densely silvery sericeous, adaxially sparsely puberulent or glabrescent, base cuneate, margin revolute, entire, apex acute or obtuse; petiole 2-4 mm. Flowers solitary, terminal on main stems and branches, subsessile, subtended by a whorl-like aggregation of 3-5 leaves. Calyx villous; tube cylindrical, 10-15 mm at anthesis; lobes triangular or lanceolate, 3-7 mm, pubescent throughout. Corolla blue-purple, tubular-campanulate, 3.5-5 cm, outside glabrous, inside densely villous at throat; lobes obovate-oblong, ca. 1/2 as long as to equaling tube, with a setose tuft at apex. Style almost extending up to corolla throat. Capsules slightly longer than calyx at maturity. Seeds oblong, ca. 1.3 mm. Fl. Jul-Sep.
● Pinus forests, dry slopes, sand dunes; 2800-4300 m. W Yunnan.