Sphenodesme annamitica Dop.

Indumentum of simple hairs. Branchlets slender, tomentose to pubescent when young, glabrescent. Leaf blade elliptic-oblong, 4-12 X 3.5-6(-8.5) cm, papery to thin leathery, tomentose to subglabrous, base cuneate. Cymes 7-flowered, arranged in loose terminal or axillary panicles; involucral bracts 6, oblanceolate-spatulate to spatulate, abaxially densely appressed pubescent, adaxially pilose. Calyx ca. 5 mm. Corolla mauve to purple, pubescent in throat; lobes 5, oblong. Stamens 5, exserted. Ovary ovate, hispid. Capsules enclosed in calyx, pilose-hispid. Fr. Oct-Nov.

Mixed forests on mountain slopes and along stream banks; 600-l500 m. S Yunnan [Thailand, Vietnam].