Premna mekongensis W. W. Sm.

Shrubs ca. 1 m tall, erect. Branchlets yellow-brown, becoming dark brown, with striate lenticels, grayish circinate tomentellous when young. Petiole ca. 1 cm, grayish puber-ulent; leaf blade ovate-lanceolate to ovate, 0.8-5.5 X 0.4-3 cm, papery, abaxially densely tomentellous, adaxially grayish puberulent, base rounded, margin subentire, repand, or serrulate, apex acuminate to obtuse. Inflorescences few to 12-flowered, 1-2.5 cm across; peduncle subsessile or very short, grayish pilose; bracts linear, densely pilose. Pedicel very short, grayish pilose. CalyX cup-shaped, 6-7 mm, 5-dentate basally to middle, densely grayish pilose, sparsely yellow glandular; teeth linear-lanceolate, subequal. Corolla yellow or white, ca. 8 mm, slightly longer than calyx, white villous in throat, 2-lipped, tube outside glabrous; lower lip 3-lobed; upper lip rounded, emarginate; lobes puberulent, sparsely glandular. Stamens included; filaments glabrous. Ovary ovate, glabrous. Fruiting calyx ca. 1 cm. Fruit black, globose, ca. 4 mm in diam., glabrous, apically glandular. Fl. and fr. Jun-Sep.

NW and W Yunnan

* 1800-2700 m.

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

澜沧豆腐柴（学名：Premna mekongensis），为马鞭草科豆腐柴属下的一个植物种。