Hemiepiphytic vine, the stems sometimes loosely attached to host on flowering plants, flowering at 1.5-4 m high on trunk; internodes 2-10 cm long, 1-1.5 cm diam., at least sometimes somewhat flattened on one side with distinct marginal ribs on the flattened portion, green turning brown in age, drying irregularly sulcate and fissured, the epidermis light yellowish or reddish brown, often cracking free in large pieces, sometimes with scurfy cracks perpendicular to the axis; cataphylls sharply two-ribbed, deciduous. LEAVES scattered along stem, spreading in the same direction as the petioles; petiole firm to spongy; 8-24 cm long, 1-1.5 cm diam., cross-sectional shape variable, obtusely D-shaped to somewhat triangular or obtusely flattened laterally, mostly broadly convex adaxially, the margins obtuse to acute, sheathed 2-5 cm at base, the apex at least sometimes with a dark green construction or a raised ring around the petiole; blades oblanceolate to oblong-oblanceolate, subcoriaceous, semi-glossy, (35)30-40(48) cm long, 4.3-12.2 cm wide, broadest well above the middle, acuminate to abruptly acuminate, narrowed to base and rounded to weakly subcordate at base, weakly arched along the midrib, medium to dark green above, slightly paler and yellow-green beneath; midrib convex to flattened and concolorous above, raised beneath; primary lateral veins at most weakly sunken above, slightly raised beneath, drying obscure (usually scarcely or not at all distinguishable on either surface), minor veins moderately obscure both before and after drying, arising at 45-60° angle, extending straight to the midrib. INFLORESCENCES erect, usually paired, less frequently 3 per axil; peduncle terete, darker green than the spathe, 4-10(14) cm long, 5-7 mm diam. (about one-third as long as, to somewhat longer than the spathe); spathe 7-13 cm long, subcoriaceous, outside glossy, tube ca. 4-5 cm long, 2 cm diam., light green on tube, cream on blade, inside creamy white, weakly constricted about midway; spadix almost sessile or with stipe to 1.3 cm long, white at anthesis (or shortly after anthe-sis), straight and extending 1-3 cm beyond the end of the spathe (persisting protruding through the end of the re-closed spathe), the pistillate portion 2.3-5.7 cm long, up to one-third or to almost one-half as long as the staminate portion of the spadix, 6-11 mm diam.; the pistils (dried) 1-1.2 mm long, 0.5-0.6 mm wide; stigma brown, button-shaped, 4-5 mm diam., depressed medially, the center often raised (the stigma thus looking like a small wheel with a central hub, often also with a series of small cavities around the hub), with a thin, whitish, more or less translucent, broad skirt around the base of the stigma (these overlapping with one another in juvenile stage, making the sides of the pistil not visible and disappearing altogether after enthesis), ovary 6-locular, locules uniovulate; staminate portion 5-8.2 cm long, 6-11 mm diam., bluntly tapered to apex, broadest at upper one-third, narrowest 2-2.5 cm from base, the staminate flowers irregularly 4-5 sided, truncate and smooth at apex, 1-1.5 mm wide in one direction, frequently flattened and much narrower in the other dimension. INFRUCTESCENCE not seen.
Ranges throughout the northern Amazon region, extending from southern Venezuela, northern Brazil (Amazonas, Rio Japura, Rio Demeny) to southern Colombia (Vaupes, Meta), Ecuador (Napo and Pastaza) to Peru (Loreto) and occurs at 120-1,130 m. In Venezuela, it is known only from Amazonas (Rio Yatua, San Carlos de Rio Negro and base of Cerro Neblina).