Philodendron attenuatum

Usually hemiepiphytic, sometimes terrestrial, or rupicolous; stems to 1 m long, drying light yellow-brown; internodes 1-4 cm long, 1-4.5 cm diam., typically about as long as broad, dark green to greenish gray and matte, scurfy; cataphylls 15.5-31 cm long, unribbed, spongy, medium green, pale green-speckled-lineate marcescent and deciduous; petioles 24.7-65 cm long 0.5-1.25 cm diam., spongy, subterete, obtusely and shallowly sulcate toward base, moderately spongy, obtusely flattened adaxially, semiglossy, densely dark green-lineate, dark green apical ring; blades ovate to ovate-cordate, 26.1-49.1 cm long, 14.5-36.6 cm wide, 1.39 (1.24-1.55) times longer than broad, 0.9 (0.7-1.1) times longer than petioles, truncate to subcordate at base with the leaf tissue usually decurrent on the petiole, subcoriaceous, moderately bicolorous, dark green and weakly glossy to semiglossy above, paler and semiglossy below, drying yellow-brown above, yellow-green below; anterior lobe length 20-40 cm, abruptly acuminate at apex; midrib broadly convex and slightly paler above, convex and much paler below, drying darker above, moderately paler below; primary lateral veins 3-5 per side, arising at an acute angle then spreading at a 50-60° angle, obtusely quilted-sunken and concolorous above, convex to slightly and paler below, drying moderately paler than the surface; minor veins moderately obscure to distinct below, minutely granular upon magnification with a paler, vein-like structure loosely coursing in a somewhat undulating pattern between the minor veins; the cross-veins typically clearly visible; laticifers if present, not obvious, the lower surface sometimes minutely granular; basal veins 4-5(-6); posterior lobes when present rounded, length 10-15 cm, width 10-14 cm; sinus, arcuate with blade decurrent and or hippocrepiform to 5.6 cm deep. INFLORESCENCES 2-3 per axil; peduncle medium green, terete, 16-21 cm long, 10-12 mm diam., semiglossy, clearly demarcated at apex, 11.5-18 cm long, drying 4-7 mm diam., dark yellowish green; spathe 16-23 cm long, moderately green and semiglossy outside, pale green and glossy inside on blade, dark violet-purple inside on tube (to ca. 3 cm high), not obviously constricted, long-attenuate and often spreading back at apex; tube to 7.7 cm wide when flattened, drying yellowish to reddish brown; spadix stipitate 1.5 cm long, drying 15.6-18.6 cm long, medium brown to dark reddish brown; pistillate portion 3.7-7.7 cm long in front, 9 mm diam. at middle, 3.4-7.2 cm long in back, pale green; staminate portion 7.2-13.1cm long, 6 mm diam., gradually long-tapered, the apex of male spadix protruding forward at anthesis, persisting dark brown post-anthesis; sterile staminate portion 5-7 mm long, 6 mm diam.; pistils 2.6-2.8 mm long, 2.6-2.8 mm diam., the style thick with rounded margins, shallowly sunken midway with a weakly raised stigma; stigma funnel-shaped, 0.4-0.5 mm diam., covered initially by a thin, very ephemeral mantle 1.4-1.5 mm wide; locules 5, 1.4-1.6 mm long; completely filled with a single, thin-walled ovular envelope filled with watery fluid; ovules with basal placentation, solitary, 0.2 mm long, funicles 0.2-0.4 mm long, the base of the funicle covered with a dense layer of glands.