Description from Flora of China
Aristolochia cathcartii J. D. Hooker.
Shrubs climbing. Stems slightly complanate, striate, brown-tomentose. Petiole 8-10 cm, tomentose to glabrescent; leaf blade ovate, rounded-cordate, or ovate-lanceolate, 20-35 × 15-30 cm, leathery, abaxially densely white tomentose, adaxially glabrate, veins palmate, 5-6 pairs from base, base cordate, sinus 1-4 cm deep, apex acute. Racemes on old woody stems, 3-5-flowered, 3-4 cm. Pedicel 2-4 cm, pendulous, brown villous; bractlets subulate, ca. 10 × 2-3 mm. Calyx yellow-green with purple veins and blotches, limb dark purple; tube geniculately curved, abaxially villous; basal portion of tube saccate, ca. 30 × 10 mm, orifice nearly quadrate; limb obliquely trumpet-shaped, ca. 3 cm in diam., 3-lobed; lobes unequal, upper 2 distinctly recurved, deltoid, lower one broadly deltoid. Anthers oblong, 3-4 mm. Gynostemium 3-lobed. Capsule ovoid, ca. 5 cm × 3-4 cm, dehiscing basipetally. Seeds not seen. Fl. May-Jun, fr. Aug-Sep.
This species is used medicinally in Xizang.
Dense forests in valleys. Xixang, Yunnan [Bhutan, NE India, Myanmar, Nepal, Sikkim].