思茅清明花 si mao qing ming hua

Beaumontia fragrans Pierre ex Pitard.

Lianas evergreen, woody, to 20 cm. Branchlets pale gray or dark brown, sparsely to densely rusty pubescent when young, glabrous when older. Petiole 1-3 cm; leaf blade obovate, narrowly obovate, or broadly elliptic, 10-30 X 3.5-15 cm, glabrous to pubescent abaxially; lateral veins 11-18 pairs. Cymes 12-20 cm, 6-12-flowered, pubescent; peduncle 3-9 cm. Pedicel 3-5 cm. Sepals pale green, elliptic, 2.7-4.5 cm, sparsely pubescent on both surfaces. Corolla white, broadly campanulate; tube 4-6.5 cm, cylindric proximally, glabrous inside; limb ca. 5 5 cm, abruptly constricted at base; lobes ovate or tongue-shaped, 1.9-3 cm, apex acute. Stamens yellow or orange; filaments 1.5-2.5 cm. Ovary pubescent. Style to 4 cm, pubescent. Follicles oblong, 14-18 X 3-5 cm. Seeds narrowly ellipsoid, ca. 2 cm, coma 3-8 cm. Fl. spring-summer.

Mixed forests, montane thickets, river banks; 1000-1500 m. S Yunnan (Menghai) [Cambodia, Laos, Malaysia, Thailand, Vietnam]

The latex is used as an arrow poison.