Description from Flora of China
Woody climbers, to 4 m, evergreen. Young branches yellowish brown, hispidulous, subglabrous when old. Petiole 1.5-3 cm, pubescent; leaf blade elliptic or oblong-elliptic, 10-20 × 5-9 cm, leathery, abaxially puberulent, adaxially glabrous, lateral veins 3-5 pairs, reticulate veins sparse, adaxially inconspicuous, base cuneate or rounded, apex acute or shortly acuminate. Cymes 3-6-flowered, arranged in a panicle 7-25 cm, 4-6 cm in diam., yellowish long pilose. Sepals 5, with purple-red stripes and spots in middle, ovate, ca. 1 mm, ciliate, densely pubescent outside. Petals 5, purple-red, narrowly oblong, ca. 3 × 0.8 mm, 5-veined. Stamens 5; filaments with purple-red spots, flattened; anthers introrse. Disk shallowly cup-shaped, shortly 5-lobed. Ovary glabrous. Schizocarp suborbicular, 1-1.2 cm in diam.; endocarp with midrib, with foveolate. Fl. Jan-Apr, fr. Mar-Aug.
Forests; below 1000 m. SW Yunnan [Bangladesh, Bhutan, NE and NW India, Myanmar, Nepal, Thailand].