Epiphytic, often appressed; internodes short on adults, 2-4.5 cm diam., (2-6 cm long on younger plants), dark green, semiglossy; eataphylls 12-37 cm long, medium to dark green to reddish (at least at base), and unribbed when young, sharply D-shaped to sharply 2-ribbed as an adult, soon dark red-brown, persisting semi-intact, fibrous at base, at first mushy, finally as pale fibers; petioles (10-) 28-80 cm long (averaging 54.5 cm), 4-7 mm diam., terete to obtusely flattened adaxially or obtusely 3-ribbed toward apex adaxially, dark to medium green, matte, closely pale-striate to conspicuously pale-streaked, conspicuous; blades ovate-cordate to narrowly ovate-cordate, acuminate at apex, subcordate to cordate at base, (20-) 29-65 cm long, 18-40 cm wide (averaging 51.5 x 30 cm), 1.4-1.9 times longer than broad, 0.7-1.3 times length of the petioles, broadest at or slightly above point of petiole attachment, slightly to moderately bicolorous, subcoriaceous; upper surface dark green and matte to velvety; lower surface yellow-green, slightly paler and weakly to moderately glossy; anterior lobe (17-)28-45 cm long; posterior lobes (5-)3-20 cm long, (9-) 14-20 cm wide, directed slightly inward; sinus parabolic to spathulate, (5-) 8-14 cm deep, 4-8 cm wide; midrib flat to broadly sulcate or broadly convex (Croat 73786) and scarcely to moderately paler above, bluntly acute, narrowly rounded, or convex and much darker below; basal veins 5-8 pair, weakly coalesced (primarily on older blades) for up to 7 cm; posterior rib naked for first 1-4 cm; primary lateral veins 7-9 per side, departing midrib at 55°-75° angles, ascending to margin, paler, obtusely to narrowly and conspicuously sunken above, convex to nearly round-raised, matte and much darker below; minor veins moderately obscure to moderately visible, fine, close. INFLORESCENCES erect to erect-spreading, 1-2 (-4) per axil; peduncle 9-12 (-20) cm long, 4-6 mm diam., pale green to whitish, coarsely striate; spathe erect, 8-12 cm long, narrowly acuminate at apex, white (pale green-streaked at base) greenish on back side, maroon on front side; spathe tube ovoid, 4-5 cm long, 2-2.5 cm diam. greenish white and glossy at anthesis inside, becoming maroonish post-anthesis (except whitish along margins), brownish maroon outside post-anthesis; spathe blade white suffused with maroon at base; spadix with pistillate portion pale green, 2.3-3.5 cm long, 1.1-1.3 cm diam.; staminate portion 5.2-5.7 cm long, 1.2-1.4 cm diam. at widest, 0.9-1.0 cm diam. at constriction; sterile staminate 1.2-1.6 cm long; sterile staminate flowers 1.8-3.2 mm long, irregular in shape; pistils (post-anthesis) 5 mm long, 2.3-3.5 mm diam.; locules 3.3 mm long, 5 per ovary; ovules 2.2 mm long, 7-12 per locule with axile placentation. INFRUCTESCENCES with spathe to 20 cm long, the tube to 4.5 cm diam.; berries greenish white; seeds 2 mm long, constricted near apex, tan, finely ridged longitudinally.
Appressed climbing epiphyte or terrestrial (or hemiepiphyte?) large vine to 1.5m high; stem ca. 1 m long; internodes short, longer than broad, 2–6 cm diam., 3–4 cm long on older stem, 6–10 cm long on branches, medium to dark green, semiglossy, becoming brown with short raised striations, becoming closely transverse-fissured; cataphylls pinkish to medium to dark green, soon dark red-brown, reddish at base, terete and unribbed when young to sharply D-shaped with 2 ribs when adult, glossy, semi-intact, marcescent then persistent in dense abundant mass, the fibers pale. LEAVES with petioles 45–90 cm long, 1.8 cm diam. midway, 1.3 cm diam. at apex, terete to obtusely flattened adaxially, margin acute and weakly erect, medium to dark green conspicuously pale-streaked, finely striate (but not raised), matte to semiglossy, 3-ribbed adaxially, medial rib obtuse; blades ovate, 34–62 cm long, 22–46 cm wide, about 1.5 times longer than wide, deeply sagittate lobed at base, caudate at apex, semiglossy, subcoriaceous, dark green above, moderately bicolorous, yellow-green, moderately glossy and paler below anterior lobe 25–55 cm long, posterior lobe 9–20 cm long, 8–19 cm wide; midrib flat or weakly sunken or raised and scarcely to moderately paler, broadly sulcate above; acute to convex and darker, sometimes paler below; primary lateral veins 7 to 9 pairs, veins quilted, obtusely and conspicuously sunken above, convex, matte and much darker below, arising acutely to 45–60° angle; minor veins moderately obscure, fine and close, semiglossy; basal veins 6–8, 1–2 free to base, 3 almost free, 5-6 fused at ca. 2 cm., others fused close to base, posterior rib naked to 2–5.5 cm; peduncle white to medium green, finely pale white-striate throughout, whitish-streaked outside, 19-26 cm long, to 1.8 cm diam.; spathe 7.5–23 cm long, 1–4 cm diam. on dried specimen, pink to violet (or maroon) to red or reddish-brown on inside and pink or white or greenish on back, maroon on front, on outside, sometimes with longitudinal violet strips, sometimes streaked pale green at base; peduncle pale green, coarsely striate; spathe tube dark green outside, pale green pre-anthesis, pale greenish white and glossy inside at anthesis, tan or creamy brown to greenish white inside post-anthesis, blade white on both surfaces; spadix 10–15 cm long, pistillate female portion 2.3–7 cm long, to 3 cm diam., pale green in early fruit, or creamy white; staminate spadix creamy white, male portion 7–8.5 cm long, ca. 1 cm dia, sterile part 1–2 cm long, ca. 1 cm diam, female flowers dark green; male flowers white. INFRUCTESCENCE not seen; INFLORESCENCES 1–6 per axil, erect.
Philodendron pogonocaule ranges from Colombia (Narino) to Ecuador (Canar, Cotopaxi, El Oro, Esmeraldas, Los Rios, Manabi, Pichincha), at elevations of 60-1,950 m, in Premontane dry forest, Premontane moist forest, Premontane wet forest and Tropical moist forest. In La Planada, the species is occasionally seen along the ridge at the end of the trail above La Posada and along the Sendero Natural.