Lianas. Leaves 3-foliolate; petiole 4-12 cm; leaflets: petiolules 0.5-1.5 cm, adaxially slightly channeled and villous; blade olive-brown or brown on both surfaces when dry, lanceolate, rarely lanceolate-elliptic, 7-17 × 3-8 cm, subleathery, abaxially glabrous, adaxially glabrous except pilose on midvein, lateral veins (3 or)4-6-paired, arising from midvein at ca. 45°, base obtuse to rounded, apex acuminate, acumen 0.7-1 cm. Flower buds ovoid, 5-8 mm. Outer tepals 0.9-1.2 cm, 3-veined. Inner tepals 0.9-1.1 cm, adaxially densely white lanose, 1-veined. Stamens with filaments pubescent adaxially; filaments straight in bud; appendages stipitate, narrowly ovate, ca. 3.5 mm, membranous, abaxially with open mouth, margin denticulate, apex obliquely truncate. Ovary glabrous. Interstaminal glands small, 2-lobed. Fruit ca. 6 cm in diam., 2-winged; large wings 2.5-3 cm wide. Fl. Aug-Nov, fr. Jan-Apr.

Forests; 700-1000(-1600) m. Yunnan [India, Malaysia, Myanmar].