Hemiepiphytic or rarely terrestrial; stem appressed-climbing or scandent, sap copious, brownish red to purple; internodes semiglossy, sometimes ribbed, 1.5–19 x 2–6 cm, longer than broad, dark green to gray-green to gray, becoming light brown to brown to gray, often scurfy, drying pale yellowish tan with flaky epidermis; roots few per node, drying medium tan or reddish brown, epidermis flaky; cataphylls 15–35 cm, unribbed or sharply 2-ribbed, medium green, pale green-lineate, drying pale white with wavy lineations, deciduous. LEAVES erect to spreading; semiglossy, 15–76 x 0.8–1.8 cm (dry), obtusely flattened adaxially, medium green, pale green-lineate, drying olive-green; blades elliptic to ovate, moderately coriaceous, acuminate to long-acuminate at apex, deeply cordate at base, 25.5–83.5 x 11–54 cm, 1.5–2.7(–3.4)x longer than wide, (1.1–)1.5–1.8x longer than petiole, broadest at point of petiole attachment, margins rounded, adaxial surface semiglossy, dark green to yellowish green, drying dull grayish olivegreen, abaxial surface semiglossy, paler than adaxially, drying semiglossy and paler than adaxially, sometimes slightly red, anterior lobe 23–61 x 11– 54 cm, 2.2–3.9(–6.9)x longer than posterior lobe; posterior lobes 2–23 x 2.5–27 cm, rounded to obtuse at apex; sinus arcuate to parabolic or spatulate, 2–24 cm deep; midrib broadly sulcate and paler than blade adaxially, bluntly acute to narrow-rounded or convex abaxially, drying nearly concolorous on both sides; basal veins 5 to 6 per side, with 1 free to base, 4 to 5 coalesced for 1–6 cm, posterior rib not naked or naked up to 3 cm; primary lateral veins, 4 to 6 per side, 3–3.5 cm apart, spreading from midrib at 60º– 65º angles, sharply down-turned at midrib, proceeding straight out to margin, bluntly concave to sunken adaxially, convex and paler abaxially, drying concolorous to darker; minor veins moderately obscure, drying moderately visible and raised. INFLORESCENCE erect, 1 to 5 per axil; peduncle glossy, 8– 14 cm, 4–8 mm diam. (dry), shorter than petiole, medium to pale green, thinly striate, drying olive- green; spathe bluntly rounded with an apiculum 3– 5 mm long at apex, 9–11 cm long, semiglossy, slightly constricted above tube; spathe blade 5.5–8 cm, pale green becoming white, then rosy red outside (at anthesis), white inside; spathe tube 3–6 cm, medium green outside, deep cherry-red to white inside; spadix barely exserted, extending slightly beyond spathe at anthesis, sessile, 9–11 cm; pistillate portion yellow-green to cream, cylindrical, 3–4 cm, to 1 cm diam. (dry); staminate portion white, clavate, 5.5–6.5 cm, to 1.5 cm diam. at widest point, 6–8 mm diam. at base (dry), broader than pistillate and sterile staminate portions; sterile staminate portion not obvious; pistils 2.5–3 x ca. 1.4 mm; ovary (4 to)5- to 6-locular, locules 1.8–2 x ca. 1.4 mm, ovules with basal placentation, 1 to 2 per locule. INFRUCTESCENCE with olive-green berries. JUVENILE PLANTS with petioles that are deeply sulcate, appearing winged, and blades that are elliptic and rounded to cordulate at base.
The species belongs to subgenus Philodendron, section Macrobelium, subsection Glossophyllum, series Ovata characterized by its deciduous cataphylls, deeply sulcate petioles appearing winged when young or juvenile, and elliptic to ovate and deeply cordate adult leaf blades with few widely spaced primary lateral veins. Also characteristic are the inflorescences that are green when young, then become rosy red on the spathe blade when mature, and are distinctly apiculate.