Changes

*Large, almost glabrous, twining perennial with tuberous rootstock. *Older stems woody, younger stems herbaceous, terete, with reddish papillae. *Leaves alternate or spirally arranged, simple; petiole 3–7 cm long; blade pentagonal in outline, 4–13 cm long and wide, palmately dissected nearly to the base, base cordate; lobes 5–7, elliptical, lanceolate or oblong-lanceolate, up to 6.5 cm × 2 cm, acute. *Inflorescence an axillary, 1–few-flowered cyme; peduncle almost erect, 3–8 cm long; bracteoles ovate, early deciduous. *Flowers bisexual, regular, 5-merous; pedicel up to 3 cm long, at first deflexed, almost erect when the flowers open and nodding in fruit; sepals ovate-oblong, up to 3 cm long, apex obtuse, glabrous, concave, somewhat unequal, enlarging in fruit; corolla funnel-shaped, 3.5–5.5 cm long, yellow or white with dark purple centre, glabrous, limb faintly pentagonal, plicate, lobes bluntly triangular; stamens included; ovary superior, 2–4-celled, style simple, filiform, stigma biglobular. *Fruit a narrowly ellipsoid capsule, 1.2–1.6 cm long, at first enclosed in the accrescent, brown and coriaceous calyx, exposed just before dehiscence when sepals spread out, pale brown. *Seeds 6–8 mm long, brown to black, minutely hairy.