Description from Flora of China
Nyctocalos shanica MacGregor & W. W. Smith.
Vines. Leaves trifoliolate; lateral petiolule 1-2 cm, terminal petiolule ca. 4.5 cm; leaflets elliptic-lanceolate to elliptic or obovate, 7-14 X 2-6 cm, glabrous, base cuneate, margin entire, apex caudate-acuminate; lateral veins 6-8 on each side of midrib, along with main veins convex on both sides. Inflorescences racemose, ca. 17-flowered, terminal, ca. 40 cm. Calyx ca. 1 cm, mouth ca. 7 mm in diam., apex subtruncate, with 5 subulate teeth ca. 3 mm. Corolla white, 4-5 cm, base constricted; lobes subequal. Stamens inserted at middle of corolla tube; filaments ca. 1.5 cm. Style filiform, glabrous, more than 7 cm; stigma 2-lobed. Capsule long terete, compressed, 18-20 X 5-6 cm, 4-5 mm thick, base constricted into a narrow tube 2-3 cm, apex short acuminate; valves thick leathery. Seeds in several rows, subrounded, membranous winged, 4-5 cm. Fl. Aug-Oct, fr. Sep-Nov.
Forests; 300-600 m. S Yunnan [Indonesia (S Java), Malaysia, N and NE Myanmar, N and SE Thailand].