Philodendron alonsoae Croat

Epiphyte; internodes 3 cm long, 1 cm diam.; cataphylls less than 5 cm long, deciduous, drying intact with reddish brown epidermis; petioles 5.7-7.9 cm long, 3 mm diam., sheathed midway and free-ending, drying narrowly and obtusely sulcate, finely ribbed and reddish brown; blades elliptic, 22.1-24.2 cm long, 10.9-11.8 cm wide (averaging 23 x 11), 2.03-2.05 (averaging 2.04) times longer than broad, broadest midway, 3.0-4.2 (averaging 3.5) times as long as petioles, abruptly acuminate at apex, (acumen to 1.2 cm long), mildly acute at base, drying coriaceous, grayish yellow-brown and semiglossy above, reddish yellow-brown and weakly glossy below; upper surface minutely and sparsely wrinkled; lower surface sparsely pustular and more conspicuously wrinkled than upper surface; midrib drying broadly convex, minutely ribbed and paler above, narrowly convex, finely ribbed and slightly darker below; primary lateral veins obscure on both surfaces; minor veins arising from midrib, drying moderately visible and distinct above and below; laticifers continuous and  weakly raised. INFLORESCENCE 1 per axil; peduncle 1.7 cm long; spathe 7.5-8.5 cm long, 1.7 cm wide, green, drying coriaceous, reddish brown; spadix 7.8 cm long; pistillate portion 1.7 cm long, 6.8 mm diam.; staminate portion 6.5 cm long, narrowly rounded at apex, the sterile staminate portion 2-3 mm long, 7 mm diam. scarcely distinguishable from the fertile flowers, slightly paler; constricted area weak, to 6 mm diam.; pistils 2 mm long, 1.2-1.3 mm diam. bottle-shaped; style slender, steeply sloping away from the apex, rounded at apex; stigma 0.6-1 mm diam., 0.6 mm thick, the stigmatic papillae forming a broad ring around the margins, depressed medially; locules 5 per ovary, 1 mm long; ovules 2-5 per locule, basal, enclosed within a translucent envelope 0.6 mm long, funicles about as long as the ovules.