Premna yunnanensis W. W. Sm.

Allied to Premna mekongensis but differs in corollas pinkish to purple, fruit as long as fruiting calyces, and calyx teeth narrowly triangular. Some of the P. yunnanensis paratype collections of G. Forrest are described as having yellowish flowers but are otherwise indistinguishable from the holotype.

Shrubs 0.8-2 m tall. Branchlets grayish minutely tomentose when young, glabrescent. Petiole terete, 5-10 mm; leaf blade ovate-lanceolate to ovate, 2-6 X 1.5-3 cm, papery, golden glandular, abaxially densely gray circinate pilose, adaxially dark green and pilose, base subrounded and slightly oblique, margin subentire to serrate, apex acuminate to acute. Calyx ca. 4 mm, deeply 5-dentate below middle, teeth narrowly triangular, both surfaces pubescent and golden glandular. Corolla pinkish to purple, ca. 6 mm, tube subglabrous but densely villous in throat, 2-lipped; lower lip 3-lobed; upper lip ca. 4 mm, subrounded; lobes puberulent, outside glandular. Stamens slightly exserted; filaments glabrous but villous at base. Ovary obovate, glabrous, apically glandular. Fruit black, 3-5 X 2-3 mm. Fl. and fr. May-Sep.

SW Sichuan, W Yunnan

* Grasslands; 1800-2200 m.

Premna yunnanensis là một loài thực vật có hoa trong họ Hoa môi. Loài này được W.W.Sm. miêu tả khoa học đầu tiên năm 1916.

云南豆腐柴（学名：Premna yunnanensis）为马鞭草科豆腐柴属下的一个种。