Description from Flora of China
Caryopteris parvifolia Batalin, Trudy Imp. S. Peterburgsk. Bot. Sada 13: 98. 1893; Isodon discolor (Dunn) Kudo; Plectranthus discolor Dunn; P. parvifolius (Batalin) P'ei; Rabdosia parvifolia (Batalin) H. Hara.
Shrubs 50-100 cm, much branched. Branches slender, yellowish gray, glabrescent, branchlets appressed whitish tomentulose. Petiole 2-12 mm; leaf blade oblong-ovate to broadly ovate, 4-15 × 4-14 mm, papery, adaxially minutely glandular pubescent, abaxially densely appressed gray tomentulose, base short truncate-attenuate, margin entire or coarsely crenate, apex rounded, lateral veins 3- or 4-paired. Cymes axillary, widely spaced, 1-7-flowered, 0.8-2.3 cm, pedunculate; peduncle 2-12 mm. Calyx campanulate, ca. 3 × 3 mm, densely whitish tomentulose, slightly 2-lipped; teeth ovate-triangular, subequal, slightly longer than calyx tube, lower 2 slightly longer; fruiting calyx dilated. Corolla purplish, ca. 9 mm, pilose, tube ca. 4 mm. Stamens and style slightly exserted. Nutlets brown, glabrous. Fl. Jun-Oct, fr. Jul-Nov.
* Dry thickets; 1600-2800 m. Gansu, Shaanxi, Sichuan, Xizang.