37. Isodon tenuifolius (W. Smith) Kudô, Mem. Fac. Sci. Taihoku Imp. Univ. 2: 119. 1929.
细叶香茶菜 xi ye xiang cha cai
Plectranthus tenuifolius W. Smith, Notes Roy. Bot. Gard. Edinburgh 9: 118. 1916; Rabdosia tenuifolia (W. Smith) H. Hara.
Shrubs to 1 m, much branched. Branchlets densely minutely gray tomentose. Petiole 3-5 mm; leaf blade lanceolate to ovate-lanceolate, 0.8-2 cm × 5-10 mm, papery, adaxially densely pilose, abaxially very densely minutely gray tomentose, base cuneate to rounded, margin remotely crenulate-serrulate above middle to entire, apex acute or slightly acute; lateral veins 3- or 4-paired, yellowish white adaxially. Cymes axillary, pedunculate, 5-7-flowered, shorter than subtending leaves, in terminal panicles to 20 cm; upper floral leaves reduced, ± equal to cymes, margin entire; bracteoles linear, ca. 1 mm, densely gray tomentulose. Calyx campanulate, to 3 mm, densely gray tomentulose outside; teeth subequal, triangular, ca. 1/3 as long as calyx, apex acute. Corolla whitish purplish, whitish rose, or purplish, ca. 7 mm, pilose; tube ca. 3 mm, straight. Stamens included. Style included. Nutlets unknown. Fl. Sep.
* Thickets; 1900-3000 m. Sichuan, Yunnan.