Philodendron grahamii Croat

Hemiepiphyte; internodes elongated, 2.8 cm long; cataphylls deciduous; petioles spongiose, obtusely flattened adaxially, 28 cm long, drying  2.2 cm diam., dark reddish brown; blades oblong-oblanceolate blades, 66.2 cm long, 24.1 cm wide, 2.75 times longer than broad, broadest midway, 2.4 times long as petioles, abruptly acuminate at apex, drying subcoriaceous, blackish brown, weakly glossy above, black brown and semiglossy below; upper and lower surface minutely granular with scattering of pustules upon magnification; anterior lobe 64.2 cm long, with straight margins; posterior lobes 3.8 cm long, 3.2 cm wide, cordulate; midrib spongiose, drying broadly convex with margins drying thin and spreading up to 4 mm wide in both directions, finely ribbed, paler above, convex, finely ribbed and slightly paler below; primary lateral veins 8 pairs, arising at a 60° angle near middle, drying convex, finely ribbed and slightly darker above, narrowly convex, finely ribbed and darker below; minor veins arising mostly from midrib but also from the primary lateral veins closer to the margins, drying obscure above and moderately visible and distinct below; cross-veins visible on upper and lower surfaces; laticifers short and discontinuous and free-ending, weakly raised on both surfaces; basal veins 2 pairs, both free to base; sinus parabolic, 2 cm deep, 1.8 cm wide at middle. INFLORESCENCES up to 3  per axil; peduncle 10.2-11.2 cm long; spathe 12.8-13.6 cm long, 3.2-3.6 cm wide, drying coriaceous, black-brown, densely granular and sparsely pustular on the outer surface, moderately glossy on inside with prominent resin canals in the tube, tube color outside green and blade color outside greenish yellow; spadix yellow-green, staminate spadix up to 7.5 cm long), sterile staminate portion 1.4-1.5 cm long, 1.7 cm wide, paler than the fertile portion, female spadix 5-5.5 cm long; pistils 1.5-18 mm long, 1-1.2 mm diam.; style completely covered with mantle; stigma 4-5 mm diam., covered with a mantle 9-11 mm wide; ovules 1 per locule, basal, truncate at apex, 0.5-6 mm long, including the funicle, the funicle slightly shorter than the ovary, densely glandular at the base; placentation basal.