Description from Flora of China
Ipomoea longipedunculata C. Y. Wu, Rep. Stud. Pl. Trop. Subtrop. Yunnan 1: 117. 1965.
Herbs climbing, ca. 1.7 m tall; axial parts mostly glabrous. Stems twisted. Petiole 5-15 cm; leaf blade cordate, basal leaves ca. 15 X 14 cm, upper leaves 5-6 X 4-5 cm, sparsely puberulent to glabrescent, base cordate, margin undulate, short ciliate, apex long acuminate. Inflorescences 6-17-flowered; peduncle 6-12 cm, pale yellowish villous distally; bracts and bracteoles persistent, ca. 2.5 mm. Pedicel 1.5-3 cm, thickened distally, pale yellow villous. Sepals purple-brown, elliptic, unequal; outer 2 ca. 7 X 5 mm; inner ones ca. 9 X 6 mm, abaxially glabrous or pale yellow villous, margin scarious, apex rounded or emarginate. Corolla white or pale rose, funnelform, 2-2.5 cm; limb with 5 short triangular lobes, pilose apically. Stamens included, inserted below middle of corolla tube; filaments pilose basally; anthers oblong, ca. 3 mm. Ovary glabrous. Capsule brown, ± globose, ca. 1.2 cm. Seeds black, 5-6 mm, glabrous.
* Open fields, thickets in valleys; 500-1000 m. Guangxi, Guizhou, Yunnan.