Streptocaulon extensum Wight & Arnott in Wight, Contr. Bot. India 65. 1834; Myriopteron horsfieldii (Miquel) J. D. Hooker; M. paniculatum Griffith; Streptocaulon extensum var. paniculatum (Griffith) Kurz; S. horsfieldii Miquel.

Lianas to 10 m. Branchlets pale gray, lenticellate, glabrous. Petiole 1.5-4 cm; leaf blade ovate-elliptic to broadly ovate, 8-18(-30) × 4-11(-22) cm, membranous, glabrous to sparsely pilose, base broadly cuneate to rounded, apex acute to subcaudate-acuminate; lateral veins 7-9 pairs. Inflorescences conical, lax, many flowered, 12-26 cm, glabrous or sparsely pubescent. Pedicel threadlike, 5-10 mm. Sepals ca. 1 × 0.7 mm, ovate, obtuse, delicate, glabrous or ciliate, reflexed at anthesis. Corolla ca. 3 mm in diam., glabrous; lobes lanceolate or ovate-oblong. Corona lobes 3-4 mm, glabrous. Follicles 7-7.5 × 3-3.5 cm, with ca. 20 wings. Seeds 8-10 × 3-4 mm; coma 2.5-3 cm. Fl. May-Aug, fr. Aug-Dec.

The roots are used as medicine for pulmonary tuberculosis and cough.

Thickets, open woods; 600-1600 m. Guangxi, Guizhou, Yunnan [India, Indonesia, Laos, Myanmar, Thailand, Vietnam]