Pachycaul herbs, massive, to 2.5m, evergreen, with slightly milky latex. Stem erect to decumbent, with short stolons terminating in tubercles arising from base. Leaves several to rather many together, clustered at tips of stems of larger plants; petiole up to 1.5m, sheath membranous; leaf blade peltate, cordate-sagittate or cordate-ovate, up to 130 × 100cm, basal margins undulate, apex shortly acuminate; primary lateral veins 9–12 on each side, interprimary veins forming well defined interprimary collective veins.