Strong climber or trailer to 9 m.; stems herbaceous, glabrous or pubescent. Leaf-blade very broadly ovate-reniform in outline, broadly cordate, dark green and scabrid above, paler and subglabrous or sparsely to densely very shortly greyish-puberulous beneath, obscurely to distinctly and coarsely sinuate-toothed, 60–192 mm. long, 40–215 mm. broad, palmately 5-lobed; lobes triangular, ovate or elliptic, broadest or distinctly narrowed at the base, and then often themselves somewhat 3(rarely–5)-lobulate, apiculate; petiole 13–126 mm. long, glabrous or puberulous, with 2 lateral apical horn like yellow-green glands.