Hemiepiphytic; stem scandent; internodes to 7.5 cm long, 1 cm diam., slender, drying 7 mm diam., gray-brown, irregularly and closely fissured, somewhat flaking; roots several per node, drying moderately smooth, reddish brown, semiglossy; cataphylls lanceolate, deciduous. LEAVES: Petioles 12--13 cm long, drying 5--6 mm diam., subterete, drying dark gray-brown, minutely striate, sheathed to 1.5 cm; blades oblong, acuminate at apex (the acumen tightly inrolled, 5 mm long), narrowly cordulate at base, 27--32 cm long, 8.5--9 cm wide (3--3.8 times longer than wide), (2.2--2.5 times longer than petiole), about as long as petiole; upper surface dark green, drying weakly glossy, gray-green, lower surface slightly paler, semiglossy, drying greenish gray; sinus to 1.3 cm deep; midrib broadly convex above, convex and paler below, drying faintly striate; primary lateral veins almost totally obscure above and below; many minor veins, all free to base, arising from the midrib only, drying obscure above, close and weakly raised below, spreading at a 55--75º angle, more or straight to the margin. INFLORESCENCES solitary; peduncle 8 cm long, drying 5 mm diam.; spathe green, 9.3 cm long, (1.2 times longer than peduncle); spathe tube weakly constricted, ca. 4.5 cm long; spadix bluntly pointed at apex, 10.8 cm long; pistillate portion 4 cm long in front, 3.7 cm long in back, 8 mm diam. at apex, drying 1 cm diam. at middle; staminate portion 8.1 cm long; fertile staminate portion 8.5 mm diam. at middle, 6.5 mm diam. ca. 1 cm from apex; sterile staminate portion 8 mm diam. at apex, 9 mm diam. at base; pistils 1.5 mm long; ovary (7)8-locular, 1.2 mm diam., with sub-basal placentation; locules 1.1 mm long, 0.2--0.3 mm diam.; ovule sac ca. 1 mm long; ovules 1 per locule, contained within transparent ovule sac, ca. 0.3 mm long; funicle ca. 0.3 mm long, (can be pulled free to base), style 0.9 mm diam., similar to style type D; style apex sloping to weakly rounded; style boss moderately broad and fairly pronounced; the androecium truncate, sometimes prismatic and weakly clavate, margins irregularly 4--5-sided, 0.8--1.5 mm long; thecae oblong, 0.2--0.3 mm wide, more or less parallel to one another; sterile staminate flowers clavate to prismatic, irregularly 4--5-sided, 1.3--1.7 mm long.