Philodendron knappiae Croat

Terrestrial or hemiepiphytic; stems usually erect; internodes short, somewhat flattened on one side with marginal ribs, moderately glossy, 0.5--7 cm long, 1--1.7 cm diam., longer than broad below, short near apex, medium green, epidermis smooth, light brown; cataphylls 10--18 cm long, sharply 2-ribbed, green, sulcate adaxially, margins weakly raised abaxially, deciduous. LEAVES: Petioles 14--19 cm long, 2--7 mm diam., bluntly D-shaped, green, tinged reddish; blades ovate-triangular, subcoriaceous, bicolorous, long-apiculate at apex, cordate at base, 16--23.5 cm long, 7.5--11.5 cm wide (1.8--3 times longer than wide), (1.1--1.4 times longer than petiole), about equal in length to petiole, upper surface semiglossy, drying dark brown, lower surface slightly paler, drying dark yellow-brown or dark yellow-green; anterior lobe 12--18.5 cm long, 10.6--13 cm wide (2.2--3.3 times longer than posterior lobes); posterior lobes 5--8 cm long, 5--6.5 cm wide (1.4--1.8 times longer than wide), narrowly to obtusely rounded; sinus hippocrepiform, 3--5.5 cm deep; midrib broadly convex, paler than surface above, convex, reddish or paler than surface below; basal veins 3(5) per side, with 0--1 free to base, 2--3 coalesced 1--1.5 cm; posterior rib naked; primary lateral veins 5--7 per side, departing midrib at a (40)55--70 (lowermost to 80º) angle, arcuate-ascending to the margins, weakly visible above, weakly raised, often reddish below; minor veins distinct below, arising from the midrib only; secretory ducts present but inconspicuous. INFLORESCENCES 1 per axil; peduncle 2--3 cm long, 5--6 mm diam.; spathe 7-8 cm long, (2.3--3.6 times longer than peduncle), weakly constricted above the tube, 1.5 cm diam. at constriction, green throughout, pinkish within; spathe tube 3--4 cm long, 1.9 cm diam.; spadix 5.5--7 cm long, white throughout; pistillate portion 1.2 cm long, 1 cm diam.; staminate portion 4.3--5.8 cm long, 8--12 mm diam.; pistils 1--1.3 mm long, 0.7 mm diam.; ovary 4-locular; locules 0.8 mm long, 0.3-0.4 mm diam., with axile placentation; ovules 4 per locule, 2-seriate, 0.2 mm long, longer than funicle; funicle 0.1 mm long, adnate to lower part of partition, style similar to style type B; style apex flat to concave; stigma more or less hemispheroid, unlobed, 0.8 mm diam., 0.2 mm high, covering entire style apex; the androecium truncate, more or less prismatic, margins irregularly 4--6-sided, mostly 4--5-sided, 0.8--1.1 mm long; thecae oblong, 0.4 mm wide, more or less parallel to one another, not contiguous; sterile staminate flowers irregularly 4--6-sided, 0.9--1.1 mm long.