二籽扁蒴藤 er zi bian shuo teng

Hippocratea arborea Roxburgh, Pl. Coromandel 3: 3. 1811.

Lianas; branchlets brown-yellow, brown when old, glabrous, oblong lenticellate. Petiole 1-1.5 cm, grooved; leaf blade broadly ovate or ovate-oblong, 8-15 × 5-17 cm, papery, base rounded or broadly cuneate, margin sparsely dentate, apex acuminate; lateral veins 6 or 7 pairs, reticulate veins horizontally spreading. Cymes solitary, axillary or terminal, usually 5-6 cm, glabrous. Flowers light yellow; sepals oblong, less than 1 mm, apex rounded, entire. Stamens longer than style; filaments flattened; anthers nearly square. Ovary with 2 ovules per locule; style ca. 1 mm, apex truncate. Fruits 1-3-fascicled capsules; capsule narrowly elliptic, 6.5-8.5(-12) × 2.5-3(-3.8) cm, base cuneate, apex subacute, 2-seeded. Seed wing ca. 6 cm, apex emarginate. Fl. Jun, fr. Oct.

Shrubs of mountainous slopes and valleys; 300-1100 m. SW Guangxi, S Yunnan [Bhutan, India, Myanmar].