Pentasacme esquirolii H. Léveillé, Fl. Kouy-Tcheou 14. 1914/15; Heterostemma gracile Kerr.

Lianas to 3 m. Branches and branchlets slender, internodes with 2 conspicuous lines of erect pilose hairs. Petiole 1.3-2.3(-5) cm, pubescent; leaf blade ovate or elliptic-ovate, (4-)6.5-10(-12) × 2-6.5 cm, membranous, glabrous or thin villous, base cuneate, sometimes minutely cordate, apex acuminate; lateral veins 3 or 4 pairs; midrib winged abaxially. Inflorescences usually subsessile, umbel-like, up to 10-17-flowered. Pedicel 1.5-3(-4) cm, threadlike. Sepals ovate, ca. 1.5 × 1 mm, puberulent, ciliate; glands minutely toothed. Corolla yellow or green, rotate, ca. 1.2 cm in diam.; lobes broadly triangular, 3.5-7 × 2-3.5, glabrous. Corona lobes oblong-ovate, ca. 1 mm, apex rounded to almost acute, flat on corolla. Follicles linear-laneolate, ca. 6 cm × 5 mm. Fl. Jul-Sep, fr. Sep-Dec.

Open woods. Guangxi, Guizhou, Yunnan [Thailand].