General:
Perennial herbaceous vine; stems twining, rough, up to 10 m long.
Leaves:
Opposite, heart-shaped at the base, stipulate, 3-5 lobed, strongly toothed, rough-hairy, 4-10 cm long.
Flowers:
Inflorescence of unisexual axillary flowers; female flowers in cylindric spikes, greenish-yellow, 3-5 cm long, yellow-glandular especially at the base of the bracts; male flowers in panicles.
Fruits:
Achenes, hidden by enlarged bracts.