Hemiepiphytic; stem probably scandent; internodes to 3.5 cm long, 8-15 mm diam., yellow-brown to dark brown, epidermis drying smooth to wrinkled, sometimes fissured closely; roots drying reddish brown, thin, elongate, drying 3 - 4 mm diam., few per node; cataphylls 14 cm long, unribbed, deciduous. LEAVES: Petioles 29-54 cm long, 8-12 mm diam., ± terete, drying yellow-brown; sheathing 3-6.5 cm; blades ovate-cordate, subcoriaceous, gradually acuminate at apex, conspicuously cordate at base, 28-55 cm long, 12.5-28 cm wide (2.2 times longer than wide), (about as long as petiole), drying subcoriaceous, upper surface drying brown to olive-green, lower surface drying greenish to yellowish brown, smooth or minutely ridged; anterior lobe 23 - 36 cm long, 21 - 27 cm wide (2.8 - 3 times longer than posterior lobes); posterior lobes 8-12 cm long, 10 - 13 cm wide; sinus parabolic; midrib drying broadly convex and usually paler than surface above, drying narrowly convex and usually concolorous below; basal veins 3 - 5 per side, free to base, several coalesced to 1 - 2 cm, occasionally 2 fused to 3.5 cm; posterior rib usually not at all naked, sometimes obscurely so for about 1 cm; primary lateral veins 3-4 per side, departing midrib at a 60 - 70º angle, weakly arcuate to the margins, drying weakly raised and usually paler than surface above, drying raised below; minor veins arising from both the midrib and primary lateral veins. INFLORESCENCES to 4 per axil; peduncle 6.5-13 cm long, ca. 1 cm diam.; spathe 15 - 21 cm long (1.6 - 2.3 times longer than peduncle), with resin canals on inner surface, visibly constricted above the tube; spathe blade cream outside; spathe tube white, heavily tinged red or purple on both surfaces, spathe lube 5 - 11 cm long; spadix sessile; 6 - 14 cm long; pistillate portion cylindrical-tapered toward the apex, 2.4-4.1 cm long, 4-9 mm diam. at apex, 5 - 10 mm diam. at middle, 6-10 mm wide at base; staminate portion 3.6÷10 cm long; fertile staminate portion (4)9 mm diam. al base, 6 - 12 mm diam. at middle, 3 - 7 mm diam. ca. 1 cm from apex, broadest at or below middle, broader than the pistillate portion; sterile staminate portion not obvious; pistils 0.5-2.7 mm long, (0.7)1.8-2.7 mm diam.; ovary 6÷8-locular, 0.4 - 1.4 mm long, 0.7 - 2.7 mm diam., with basal (to sub-basal) placentation; locules 0.4 - 1.4 mm long, 0.9 mm diam.; ovule sac 0.3 mm long; ovules 2 per locule, contained within a translucent, gelatinous ovule sac, 0.1-0.2 mm long, much shorter than funicle; funicle 0.7 - 0.9 mm long, style 0.4 mm long, 0.4 - 1.5 mm diam., similar to style type D; stylar canals emerging at base of apical depressions and arranged separately in a ring on orifices around center; style apex flat; style boss moderately shallow to moderately prominent;stigma discoid, 0.4 mm diam., 0.1 mm high, covering entire style apex; thecae oblong to weakly ovate, 0.2 - 0.4 mm wide, divaricate.