箭药藤 jian yao teng

Tylophora belostemma Bentham, not T. hirsuta Wight.

Lianas to 4 m, hirsute throughout. Petiole 1-2 cm; leaf blade ovate-oblong, 2.5-5 × 1.2-3 cm, membranous, base shallowly cordate, apex acuminate; lateral veins 4 or 5 pairs. Inflorescences shorter than leaves, with 1 or 2, many-flowered, umbel-like cymules; peduncle shorter than pedicels, 0.5-1.5 cm, rachis when present much shorter; bracts linear, to 2 mm. Pedicel threadlike, 1-2 cm. Sepals broadly lanceolate, ca. 0.8 mm. Corolla purple, rotate, glabrous except for lobes; tube ca. 0.7 mm radius; lobes oblong, ca. 2 × 1 mm, apex rounded, sparsely pilose toward margin. Corona dark purple except for conspicuous pale margin of anther appendages; pollinia suberect. Ovaries glabrous. Stigma head flattened. Follicles solitary, apparently slender fusiform (mature fruit not seen). Fl. Jul.

Dense forests, thickets; 700-1500 m. Sichuan, S Yunnan [India, Nepal].