Description from Flora of China
Henckelia villosa (D. Don) Sprengel; Roettlera villosa (D. Don) Kuntze.
Stems to 9 cm, spreading villous. Leaves crowded near stem apex; petiole 1-16 mm; leaf blade elliptic to rhombic, ovate, or obovate, 2.5-7.2 X 2-5 cm, herbaceous to papery, adaxially densely villous to appressed puberulent, sparsely yellow glandular, abaxially densely villous to sparsely puberulent, sparsely yellow glandular, base oblique, broadly cuneate to subcordate, margin irregularly double dentate to crenate, apex acute to rounded; lateral veins 3 or 4 on each side of midrib. Cymes 2-5-flowered; peduncle 2-5 cm, glabrous; bracts connate at base, broadly ovate, ca. 2 mm, glabrous, margin entire. Pedicel 5-10 mm. Calyx slightly zygomorphic, ca. 4 mm; limb indistinctly 2-lipped, 5-lobed; tube 2.2-2.5 mm; lobes nearly equal, triangular to orbicular, 1-1.5 mm, glabrous, margin entire. Corolla dark purple, to 2.2 cm, glabrous; tube cylindric, ca. 1.5 cm X 4 mm; adaxial lip ca. 3 mm; abaxial lip ca. 7 mm. Stamens glabrous; filaments ca. 1.8 mm; anthers ca. 1.2 mm; staminode 1, ca. 0.6 mm. Pistil ca. 1.3 cm, glabrous; ovary ca. 1 cm. Capsule 1.4-2 cm. Fl. Jun-Jul.
Stony cliffs in valleys; 2100-2700 m. S Xizang [Nepal].