Terrestrial, epilithic, or hemiepiphytic; stem appressed-climbing, to 2 m long, sap brownish orange; internodes weakly glossy, 2--4 cm long, 1.5--2.5(5.5) cm diam., longer than broad, sometimes obtusely flattened on one side, medium green to gray-green, drying brown to yellow-brown, epidermis smooth to closely fissured; roots few per node, drying dark brown to yellow-brown, epidermis sometimes flaking; cataphylls subcoriaceous, 7.7--45 cm long, sharply D-shaped to sharply 2-ribbed, rarely weakly 2-ribbed, light green to whitish, tinged reddish, generally deciduous intact, weakly emarginate at apex, margins clear. LEAVES erect-spreading to spreading with blades pendent; petioles 30-45(65) cm long, 7--18 mm diam., erect-spreading, subterete to D-shaped, somewhat spongy to moderately firm, obtusely flattened adaxially, sheath 3--11 cm long; blades ovate-cordate to sagittate, subcoriaceous, moderately bicolorous, gradually acuminate at apex, cordate at base, (32)41-47(64) cm long, 16.5-40 cm wide (1.2-2.5 times longer than wide; 1-1.5 times longer than petioles), margins hyaline, upper surface dark green, drying dark brown to blackened, sometimes yellow-green, lower surface slightly more glossy, paler, drying yellow-brown to reddish brown, sometimes greenish brown; anterior lobe 20.5--53 cm long, 12-40 cm wide (3.4-3.8 times longer than posterior lobes); posterior lobes rounded, 6--14(20) cm long, 5.4-15(20) cm wide, directed toward base; sinus more or less parabolic to V-shaped or spathulate, 8-15 cm deep; midrib broadly convex to flat, slightly paler than surface above, convex and slightly paler below; basal veins 3-6 per side, with 0-1(2) free to base, coalesced (0.4)1.3-4(8.5) cm; posterior rib not naked or obscurely naked to 1 cm at base; primary lateral veins (3)4-6 per side, departing midrib at a (45)50-60(80)º angle, straight or weakly arcuate to the margins, flat to sunken and paler than surface above, convex below; minor veins weakly raised, moderately visible, arising from both the midrib and primary lateral veins. INFLORESCENCES spreading-pendent, 1-2(4) per axil; peduncle 5-13.5(17) cm long, 7-11 mm diam.; spathe coriaceous, (6.5)12-19 cm long, ((0.7)1.4-2.4) times longer than peduncle), weakly or not at all constricted above the tube, acuminate, usually greenish throughout, broadest at or below the middle; spathe blade greenish white outside, spathe red to maroon or greenish white, glossy inside; spathe tube sometimes reddish outside, 5--8 cm long, 2.5-3.5(5) cm diam., red to maroon or dark violet-purple, pale-lineate, glossy inside; spadix stipitate to 4 mm long; clavate to cylindrical, bluntly pointed at apex, 11.5-14 cm long, broadest at the middle or more or less uniform throughout; pistillate portion 3.3-6.9 cm long, 1.2-2.7 mm diam. at middle, narrowed somewhat at both ends; staminate portion 5-9.2 cm long; fertile staminate portion tapered to cylindrical or clavate, usually longer than pistillate portion, 11-14 mm diam. at base, 8-15 mm diam. at middle, 5-7 mm diam. ca. 1 cm from apex, broadest below middle, equal in length to pistillate portion, narrower than pistillate and sterile portions; sterile staminate portion, 11-30 mm diam., usually broader than pistillate porton at anthesis; pistils 1.7-8.5 mm long, 1.3-2.9 mm diam., ovary (5)6-8-locular, with basal to sub-basal placentation; ovules 1-4 per locule, arranged digitately in translucent ovule sac, 0.2-0.6(1.5) mm long, equal in length to funicle; funicle adnate to lower part of partition, style 0.9-3 mm long, similar to style type B; style apex flat; stigma discoid to subdiscoid; thecae cylindrical to elliptical, 0.5 mm wide, contiguous. INFRUCTESCENCE with spathe green outside, dark purple-violet inside, 11.5-14 cm long; berries white to yellowish; seeds 1(3-4) per locule, oblong-ellipsoid, sometimes obovoid, 1.7-2.2 mm long, 0.--1.8 mm diam., with clear longitudinal and faint latitudinal striations and speckled with shiny, silver raphide cells; funicular scar knob-like, clear, thicker than the seed body.