Philodendron ampamii Croat

Large, epiphytic; internodes short, drying 3.5 cm diam., yellow-brown, coarsely and irregularly acute-ridged; cataphylls not seen, but promptly deciduous. LEAVES: Petioles to ca. 1 m long, subterete near apex, drying narrowly and deeply sulcate toward the based, broadly flattened near the base, finely to coarsely ribbed abaxially, drying dark reddish brown, matte; blades deeply 3-lobed, 72 × 75 cm, subcoriaceous, drying dark yellowish gray-brown above, paler and reddish brown below; medial lobe 51.5-57.5 × 30-40 cm; posterior lobes 32-41 × 17.5- 26 cm, spreading laterally, the lower margin straight or prominently sinuate; basal veins 18 pairs, the 1st pair free to the base, the remaining variously united into a posterior rib which extend straight to the tip of the blade, 11-12 veins basioscopic, 7 acroscopic; midrib broadly convex and slightly paler above, more nearly convex and finely ribbed below, drying yellow-brown and paler than the surface; primary lateral veins 5-7 per side, arising at 60-70° angle; minor veins drying weakly raised, concolorous, arising from both the midrib and the primary lateral veins. INFLORESCENCE: 5 per axil, white, drying dark red-brown; peduncle 5-8.5 cm long, drying flattened, 3 mm diam., finely ridged; spathe white, 12.5-17.5 × 2-3 cm on drying, matte, minutely granuliform and covered sparsely with minute white globular protrusions (not capable of being scraped free without disintegrating); spadix 15.6 cm long; pistillate portion 7.2 cm long; staminate portion 8.6 cm long; pistils 2 × 1 mm on drying; style 1.2 mm diam., drying pale brown; 0.8-0.9 mm diam.; locules 5; ovules 1 per locule.