Monoecious tree, usually less than 12 (20) m tall; trunk lenticellate; outer bark thin; inner bark thick, granular, with copious milky sap; wood yellowish. Petioles stout, (2) 4-7 cm long; blades ovate in outline, deeply pinnately lobed, acuminate at apices of lobes, the blades acute at base, 30-80 (100) cm long, 15-40 (65) cm wide, thick and leathery, scabrous, usually pubescent below and on veins above; stipules fully amplexicaul, to 15 cm long, conspicuously appressed-pubescent, deciduous. Peduncles stout, 5-8 cm long; staminate spikes club-shaped, 20-40 cm long, ca 3 cm diam at apex, narrower at base, the staminate flowers dense; perianth 2- or 4-lobed, ca 3 mm long; stamen solitary; anther exserted, oblong, bilobed. Distillate flowers in globular or oblong spikes; perianth tubular, embedded in the fleshy rachis; style exserted; stigmas entire, 2- or 3-lobed; fruiting pedicels to 7.5 cm long, 1.5-2 cm wide. Syncarp ellipsoid or rounded, 10-30 cm long, green and soft at maturity, the surface asperous with numerous round or isodiametrical segments or echinate; seeds many. Croat 10121.