Hemiepiphyte, epiphytic to 30 m and sometimes a terrestrial vine on steep banks; sap light brown or orange; internodes moderately short, usually twisted into spirals, 2–9 cm long, 1.5–8 cm diam., medium to dark green or gray to gray-brown, matte to weakly glossy becoming light brown and transversely scurfy; roots, smooth, gray-green, 1-3 per node, extending to the ground; cataphylls 23–40 cm long, pale to medium green, sometimes pinkish, matte to weakly glossy, densely dark green-short-lineate (sometimes densely reddish lineate), unribbed or 1-ribbed to sharply 2-ribbed or D-shaped, soft, deciduous, (marcescent, persisting semi-intact, becoming brown, eventually only the base persistent), sometimes tinged with maroon toward base; LEAVES: Petioles terete, 2.0–2.7 cm diam. midway and to 4 cm diam. at swollen bases, conspicuously swollen and fleshy when young, obtusely and weakly flat near apex, medium green, matte to semiglossy, spongy to moderately firm, 44-80 cm long, (usually about as long as blades), finely striate to faintly and minutely short dark-green to dark reddish-lineate (sometimes with a dark purple ring at apex); blades cordate-sagittate, 25-60 cm long, 38 cm wide, prominently cordate at base, cuspidate at apex, subcoriaceous, dark green and semiglossy above, moderately paler and matte to semiglossy below, slightly to moderately bicolorous; midrib flat (or broadly sunken) to broadly convex and paler to slightly paler above, narrowly raised to thickly convex below, paler and weakly glossy below, short dark-lineate below, concolorous; primary lateral veins 13–18 pairs, moderately distinct, fine, flat-convex, (weakly sunken to bluntly- or quilted-sunken especially toward apex), slightly paler and concolorous above, narrowly rounded and thickly convex, paler, matte and concolorous below; minor veins fine, weakly raised above, mostly flat below, moderately distinct; posterior lobes moderately rounded, 8.5–27.5 cm long, 6.0–22 cm wide at middle, sinus spathulate, sometimes hippocrepiform, 7–28 cm deep, narrowly to broadly rounded at apex; basal veins 6–13, with 1–2 free to base, 3rd and higher order coalesced along a well developed posterior rib, 1.0–5.5 cm from base. INFLORESCENCE (1) 2–3 up to 6 per axil; peduncle 8.5-23 (40) cm long, medium green, faintly striate, up to 3 times longer than spathe, often of the same green shade; spathe 8.5–24 cm long, clearly demarcated from peduncle, glossy to weakly glossy, yellow green to dark green or sometimes maroon outside; yellow green to brownish inside, post-anthesis; tube pale green or shaded maroon or violet-purple inside, tinged weakly onto the whitish blade; inner surface of spathe exuding reddish orange resin droplets in middle area at the base of blade; spadix ca.1–1.5 (2+) cm diam. and protruding beyond spathe ca. 3 cm post-anthesis, stipe sometimes purple; pistillate spadix pale green with pale greenish white flowers; staminate flowers creamy white..