29. Premna mekongensis W. W. Smith, Notes Roy. Bot. Gard. Edinburgh. 9: 120. 1916.
澜沧豆腐柴 lan cang dou fu chai
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.
* 1800-2700 m. NW and W Yunnan