Climbing herb. Stem to 4 cm diam., internodes short. Cataphyll to 26 cm long, wilting and drying in place, later decomposing to masses of fine, reticulate, tan fibers and epidermal remains. LEAVES: Petiole terete at middle, toward apex slightly flattened, 54-62 cm long. Leaf blade 0.73-0.85 as long as petiole, reflexed, subcoria-ceous (in sicco), more or less ovate in outline,- or one side with margin nearly straight in lower half, 45-51 cm long, 26-29 cm wide (1.6-1.76 times longer than wide), base cordate-sagittate, toward apex obtuse and widely acuminate (1.5 cm); posterior lobes introrse, trapeziform-triangular and angulose but apically blunt, or more or less rounded, separated by a somewhat spathulate or submitriform sinus 14-15.5 cm deep; matte on both faces (in sicco), I. lateral veins ca. 5 per side with well-marked II. and III. laterals, arising at angle of ca. 60-65°, arcuate throughout, posterior lobes with 2 principal lateral veins toward outside and 2-3 weaker ones descending, the basal ribs nude in sinus for 2-4 cm. INFLORESCENCE unknown.