Description from Flora of China
Plectranthus smithianus Handel-Mazzetti, Acta Horti Gothob. 9: 93. 1934; Rabdosia smithiana (Handel-Mazzetti) H. Hara.
Shrubs 50-100 cm. Branchlets yellow-brown, sparsely minutely pubescent or glabrescent. Petiole 0.3-2.4 cm; leaf blade rhombic-ovate to ovate, 2.5-4 × 0.9-2 cm, thin papery, adaxially papillate, glandular, sparsely hirtellous especially along margin, abaxially puberulent, base cuneate to truncate, margin sparsely coarse crenate to crenate-dentate, apex obtuse, lateral veins 3- or 4-paired. Panicles terminal, racemose; cymes pedunculate, 1-7-flowered; floral leaves and bracts entire; bracteoles linear, ca. 1 mm. Pedicel 2-6 mm. Calyx campanulate, ca. 3 × 3 mm, gray tomentulose, 2-lipped nearly to middle; teeth subequal, ovate-triangular; fruiting calyx ca. 5 mm, slightly curved, conspicuously veined. Corolla white on upper lip, purple-red on lower, 7-9 mm, pubescent outside, limb 2-lipped; upper lip as long as lower lip, ca. 4 mm. Stamens and style slightly exserted. Nutlets yellow-brown, triquetrous, ovoid, ca. 1.5 mm, glabrous. Fl. Jul-Sep.
* Thickets; 2600-3500 m. Sichuan, Xizang.