Usually hemiepiphytic or epiphytic; stem appressed-climbing, semiglossy, sap watery, weakly turpentine-scented, leaf scars conspicuous, 2 cm long, 1 cm wide; internodes sometimes obscured by cataphylls, sparsely short-striate, about as long as broad or sometimes longer than broad, 2--8 cm diam., dark green to gray-green, eventually brown, epidermis sometimes cracking, fissured longitudinally; roots short, few per node; cataphylls 20--30 cm long, sharply 2-ribbed, C-shaped, semiglossy, dark green, densely pale lineate, persisting as reddish brown, semi-intact fibers, eventually deciduous. LEAVES: petioles (37)47--111 cm long, (3-5)6--13(16--22) mm diam., erect-spreading, D-shaped, marginally winged, broadly convex adaxially, with adaxial margins slender, erect, undulate, medium green, weakly glossy, conspicuously pale striate; sheath with margins involute; blades ovate, subcoriaceous, semiglossy, moderately bicolorous, abruptly acuminate at apex (the acumen inrolled, 2--4(6) mm long), broadly cordate at base, 36--93 cm long, 22--84 cm wide (0.7--1.5(2.9) times longer than wide), (0.6--0.9 times the petiole length), margins weakly undulate, upper surface dark green, lower surface much paler, glossy, drying yellow-green; anterior lobe 23.5--65(84) cm long, 22.1--75(86.4) cm wide (1.1--2.8 times longer than posterior lobes); posterior lobes 12--33 cm long, (11)15--34 cm wide, directed inward, broadly rounded to broadly obtuse; sinus spathulate to rhombic; basal veins 7--10 per side, first free to base, part of remainder coalesced 1--6 cm, loosely so distally; posterior rib naked to 6 cm; midrib flat to broadly sunken, paler than surface above, convex to narrowly rounded, paler than surface below; primary lateral veins 3--6 per side, departing midrib at a 45--55º angle, more or less straight to weakly arcuate to the margins, deeply sunken, paler than surface above, raised to convex, paler than surface below; interprimary veins weakly raised, darker than surface below; the minor veins moderately distinct, arising from both the midrib and primary lateral veins. INFLORESCENCES erect, 2--4 per axil; peduncle (2)4--12 cm long, 4--13 mm diam., medium green, coarsely white streaked toward apex; spathe 11--29 cm long (1.4--3.8(5) times longer than peduncle), more or less cuspidate at apex; spathe blade light green outside, greenish white inside; spathe tube abruptly delineated from tube, reddish to purplish to dark purple-violet (B & K purple 2/10) or dark green and raised-white-striate at base outside, red to magenta inside; spadix weakly stipitate, exserted from the spathe, constricted above sterile staminate portion; pistillate portion pale green, 4.3 cm long in front, 3.8 cm long in back, 2 cm diam. at apex, 1.7 cm wide at base; staminate portion 16--18 cm long; fertile staminate portion white, 1.7 cm diam. at middle; sterile staminate portion 1.4--2.2 cm diam.; pistils 2.2--2.8 mm long, 1.1--1.4 mm diam.; ovary 6-locular, with axile placentation; locules 1.5--1.9 mm long, 0.4 mm diam.; ovules ca. 20 per locule, 2-seriate, somewhat translucent, 0.2--0.3 mm long, longer than funicle; funicle 0.1--0.2 mm long, adnate to lower part of partition, style similar to style type B; style apex flat to weakly rounded; stigma subdiscoid to weakly hemispheroid, sometimes weakly lobed, 1.5 mm diam., 0.5 mm high, covering entire style apex; the androecium truncate, prismatic, margins irregularly 4--6-sided, 0.7--1.5 mm long; thecae oblong, 0.4 mm wide, not contiguous, more or less parallel to one another; sterile staminate flowers irregularly 4--5-sided, 1.5--2.5 mm long. INFRUCTESCENCE with spathe green at base and tip, purple around fruiting area when ripe, berries pale brown to white. JUVENILE and PRE-ADULT plants with petioles flattened adaxially; blades broadly ovate. PRE-ADULT blades broadly ovate, 28.5 cm long, 22.5 cm wide.