Plants annual. Petiole 5-10 cm; leaf blade palmately (3 or)5-9-lobed, sometimes simple, 7-10 × 7-10 cm, papery, abaxially with rigid spinulose hairs on veins, adaxially pubescent but not densely so, base cordate; lobes ovate-triangular, margin serrate. Male inflorescences 15-25 cm. Male flowers: yellowish green. Female inflorescences ca. 0.5 in diam.; bracts ovoid, 7-10 mm, papery, spinulose, apex acuminate. Female flowers: 1 per bract inflorescence; ovary included by bracts; styles exerted from bracts. Infructescences 0.5-1.5(-2) cm. Achenes exerted from bracts when mature. Fl. spring to summer, fr. autumn.