Terrestrial or hemiepiphytic, 0.5-1 m tall or appressed climbing to 3 m; stem sometimes decumbent or pendent, 1-1.2 cm diam., internodes 1-4 (6) × 7-15 cm diam., matte, gray-green to olive-green, drying ribbed, weakly striate. LEAVES: Petioles 12-23 cm long, dark green to yellowish brown, matte and finely costate, minutely granular on surface, sheathed to near the middle or up to 1 cm below blade attachment, sheath broadly winged, splayed widely at apex to 3.4 cm wide when flattened, rounded and weakly free-ending at apex, the free portion of petiole sharply and deeply D-shaped, 2-3 mm diam.; blades subcoriaceous, ovate to ovate-elliptic, 19.5-29 × (7.8)10-13.7 cm, 1.6-2.3 times longer than wide, 1.2-1.6 times longer than petioles, gradually long-acuminate at apex, prominently decurrent at base, bicolorous, subvelvety matte, dark green (sometimes almost blackened) drying matte and gray above, paler, matte and yellow-green to gray-green below; midrib broadly convex and slightly paler to concolorous, finely costate above, broadly convex and paler, minutely granular below; primary lateral veins 13- 17 per side, mostly aggregated near the base, arising in a sweeping curve (especially those near the base) at an acute angle then spreading at 40-70° angle, minutely undulate and scarcely more prominent than the minor veins on upper surface, weakly raised and paler than surface below, minor veins moderately obscure. INFLORESCENCE 1 per axil, rarely 2 per axil (Croat et al. 87854); peduncle 10-16 cm × 3-4 mm, medium green with dark green striations, drying yellowish green, dark brown or pale yellow-brown; spathe 11.5-16 × 1.5-1.7 (3) cm, white to creamy white, or greenish yellow, the spathe tube green, the lower 2/3 of the entire inner surface greenish white, lined with intermittant red streaks, drying greenish yellow-brown, pale green within post anthesis with brown resin canals; spadix 6-15 cm long, elongating in fruit with the staminate spadix protruding slightly beyond the end of the spathe, creamy white; pistillate portion 2-3.3 cm × 7-9 mm, pale green to pale yellow-green; staminate portion 5-5.5 cm long, the sterile staminate portion 1 cm × 8 mm diam.; pistils 1.8 × 7-9 mm, densely and minutely warty at apex; stigma 0.5-0.6 mm diam., drying dark brown, the style apron to 1 mm wide, pale brown. INFRUCTESCENCE orange.