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4. Cynanchum heydei J. D. Hooker, Fl. Brit. India. 4: 25. 1883.
西藏鹅绒藤 xi zang e rong teng
Vincetoxicum heydei (J. D. Hooker) Kuntze.
Stems slender, twining, to 1.5 m, sparsely puberulent when young. Petiole 2-3 cm; leaf blade lanceolate to oblong-lanceolate, ca. 5.5 × 2-2.6 cm, slightly fleshy, sparsely puberulent when young, base very deeply cordate, basal lobes incurved and overlapping, apex acute; basal veins 3-5, lateral veins 5-6 pairs. Inflorescences short racemelike, to 3.5 cm, to 9-flowered; peduncle to 1.6 cm. Pedicel 5-8 mm. Sepals ca. 2 × 0.8 mm, slightly puberulent. Corolla lobes oblong-lanceolate, ± erect, ca. 4.5 × 1.8 mm, glabrous, apex rounded. Corona cylindric, ca. 1.5 mm, margin produced into 5 linear lobes longer than corolla, interior with 5 short, ligulate appendages, sinus smooth. Stigma head apiculate at apex.
Forests. W Xizang [Kashmir, Pakistan].
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