Description from Flora of China
Plectranthus nervosus Hemsley, J. Linn. Soc., Bot. 26: 272. 1890.
Herbs perennial, to 1 m tall. Stems erect, unbranched or few branched, pubescent, glabrescent. Petiole 2-10 mm, obsolete in basal leaves, pubescent; leaf blade lanceolate, 3.5-13.5 × 1-2 cm, papery, adaxially pubescent along veins, abaxially glabrescent, base cuneate, margin coarsely crenate, apex acuminate; lateral veins 4- or 5-paired, elevated. Panicles terminal, loose; cymes pedunculate, (3-)5-9(-15)-flowered; bracts narrowly lanceolate, 1-1.5 cm, densely pubescent; bracteoles linear, 1-2 mm. Calyx purplish, campanulate, ca. 1.5 mm, densely pubescent outside; teeth 5, lanceolate, subequal, apex acute, ca. 0.8 mm; fruiting calyx broadly campanulate, ca. 2.5 × to 3 mm; teeth triangular-lanceolate, erect, ca. 1.3 mm. Corolla blue or purple, 6-8 mm, sparsely pilose outside; tube 3-4 mm. Stamens exserted. Style exserted. Nutlets ovoid, 1-1.5 mm, apex pubescent. Fl. Jul-Oct, fr. Aug-Nov.
* Grassy banks, forest margins, shady areas in forests, among bushes; 100-1700 m. Anhui, Guangdong, Guangxi, Guizhou, Henan, Hubei, Jiangsu, Jiangxi, Shaanxi, Sichuan, Zhejiang