Heterostemma oblongifolium Costantin

Lianas to 3 m, internodes with 2 lines of hairs. Petiole 1.2-3(-4.5) cm; leaf blade oblong to rarely ovate-oblong, 7.5-14(-17.5) × (2.8-)3.5-5.4(-7) cm, thin leathery, base rounded, apex acute; lateral veins 5-7 pairs. Inflorescences umbel-like; peduncle 1-2 mm, 4 or 5 flowers open at 1 time. Pedicel (0.8-)1.2-2.2(-3.5) cm. Sepals oblong. Corolla greenish outside, yellowish or orange inside, rotate or shal-lowly bowl-shaped, 1-1.5 cm in diam., divided ca. halfway; lobes triangular-ovate, 4-7(-9) × 2.2-3.2(-6) mm. Corona lobes horizontally stellate spreading, oblong-oblanceolate to circular, 0.8-1.5 × 0.7-1.4 mm, apex rounded or acute, basal tubercle ± absent. Follicles linear-lanceolate in outline, 12-13.5 × 0.9-1 cm, diverging at ± 180º or more. Seeds linear-oblong, ca. 2 cm × 3 mm; coma ca. 3 cm. Fl. Aug-Oct, fr. Sep-Dec.

Guangdong, Guangxi, Hainan, Yunnan [Laos, Vietnam]

Mixed woods, thickets; 100-200 m.