Description from Flora of China
Boea densihispidula S. B. Zhou & X. H. Guo; B. mairei H. Léveillé; Streptocarpus clarkeanus (Hemsley) Hilliard & Burtt.
Petiole to 10 cm; leaf blade ovate to broadly ovate, elliptic, or obovate, 2-10 X 1.4-7 cm, white to gray or yellowish appressed pubescent, base often oblique, broadly cuneate to cordate, margin crenate to serrate, apex acute to rounded; venation pinnate, lateral veins 5-7 on each side of midrib. Peduncle 3-18 cm, grayish puberulent to pubescent; bracts broadly ovate to narrowly ovate, 4-9 mm. Calyx 6-9 mm, 5-lobed from middle; lobes triangular or oblong to ovate-oblong, 3-4 X 2-2.5 mm, outside puberulent, inside glabrescent to puberulent and glandular puberulent. Corolla white to blue or blue-purple, 1.4-2.2 cm, outside glabrescent to densely pubescent to short villous, inside glandular puberulent to glabrescent; tube 1-1.5 X 0.7-1 cm; adaxial lip lobes 3-5 mm; abaxial lip lobes 4-5 mm. Filaments ca. 7 mm, glabrous to glandular puberulent toward anther; staminodes 2 or 3. Pistil 0.9-1.6 cm; ovary 5-8 mm; brownish puberulent to glandular puberulent. Style glandular puberulent to glabrous. Capsule 1.8-4.5 cm. Fl. Jun-Aug, fr. Jun-Oct.
* Crevices of rocks on slopes; 500-3100 m. Anhui, Hubei, Hunan, Jiangxi, S Shaanxi, Sichuan, NW Yunnan, Zhejiang.