High-climbing, resinous-scented, scandent epiphyte. Stem with internodes 4-10 x 1-2 cm, shortening and thickening in flowering phase, epidermis greyish-green (yellowish when dry), producing several reddish-brown clasping roots at each node. Cataphylls c. 14 cm long, soon deciduous. LEAVES: Petiole 44-87 cm long, 0.9-1.5 times as long as lamina, terete, with sheath 4-8.5 cm long when subtending inflorescence. Lamina 30-82 x 20-50 cm, 1.4-1.7 times longer than broad, normally broadest below petiole insertion, triangular in outline, margin lobed or strongly sinuate, marginal lobes 5-7 per side, 1.5-3.5 cm long, most strongly marked at middle of leaf, becoming less distinct towards leaf apex and on inner edge of posterior lobes, apex shortly acuminate, base sagittate, posterior lobes obtusely-tipped, separated by broadly oblong sinus 0.2-0.3 times as long as lamina; primary lateral veins of anterior lobe 4-5 (-6) per side, diverging at 75° - 80° from midrib, somewhat prominent and pink-tinged on abaxial surface; basal ribs of posterior lobes straight, strongly developed, denuded proximally for 1.4-4 cm, with 2-3 well-differentiated main acroscopic veins and 2-3 weaker byt distinct main basiscopic veins. INFLORESCENCES 1-2 (?) per leaf axil. Peduncle 14-17.5 (-20) cm long, equal or subequal to spathe, terete. Spathe 14.5-16.5 cm long, ca. 2 cm in diameter, outer surface green, inner surface crimson basally, paler to white apically; spadix subsessile, obliquely inserted on peduncle, 13.5-14(-15) cm long, basal pistillate part 3.5-4 x 0.9-1.2 cm, lengthening and thickening in fruit, central staminodial part 1.5-2 x 1.3-1.5 cm, apical staminate part 8 x 1.1-1.2 cm; ovary 7-8 locular, each locule with 4.5 axile ovules attached near base, style conical, stigma capitate, subspherical. Fruit oblong, white, few to several-seeded. Seeds 3-4 mm long, oblong, l-2 per locule.