Anthurium uleanum var. nanayense Croat

Epiphytic, sometimes terrestrial; stem moderately slender, elongate, creeping, up to 100 cm long, 0.7-1.7 cm diam.; leaf scars obscured by root mass, 0.4-1 cm high, 0.9-1 cm wide; roots forming a dense, contiguous mass, ascending or descending, pale green to white, when dried grayish to brownish gray, smooth, fleshy, elongate, tapered, to 10 cm long, (1)2-3 mm diam.; cataphylls subcoriaceous, lanceolate, 3-6 cm long-, acuminate at apex, drying brown to reddish brown, persisting semi-intact, eventually deciduous. LEAVES spreading- pendent to spreading; petioles 5.5- 19 cm long, 2-4 mm diam., subterete to C-shaped or sometimes D-shaped, with medial rib and margins raised adaxially, rounded abaxially; geniculum slightly thicker and paler than petiole, sometimes up to 3 cm remote from base of the blade, 0.3-1 cm long; sheath 2-2.5 cm long; blades thinly coriaceous, somewhat chartaceous, broadly elliptic to oblanceolate or broadly oblanceolate, shortly acuminate and apiculate at apex (the acumen down-turned, 10-15 mm long), usually attenuate (sometimes acute to obtuse) at base, 22.5-43.5 cm long, 8-17.5 cm wide, broadest at or above the middle, the margins sometimes concave near the base; upper surface matte to semiglossy, medium green, lower surface matte, slightly paler; both surfaces drying matte to sometimes weakly glossy, grayish green to brown, with reddish brown major veins; midrib bluntly to acutely raised at base, becoming narrowly raised toward the apex above, prominently convex to higher than broad and slightly paler than surface below; primary lateral veins 5-7 per side, departing midrib at 40-55º angle, straight then arcuate to the margin, prominently convex above, occasionally raised in shallow valleys, more prominently raised below; interprimary veins if present almost as conspicuous as primary lateral veins, weakly sunken above, raised below; tertiary veins obscure above, flat to slightly raised and somewhat darker than surface below; reticulate veins slightly raised or obscure below when dried; collective vein arising from near the apex or absent, if present weakly sunken to flat above, raised below, drying less prominent than primary lateral veins and raised on both surfaces, ca. 3-7 mm from margin. INFLORESCENCES much shorter than leaves; peduncle (4.8)16-28 cm long, drying 1-3 mm diam., 1.2-4.4 x as long as petiole, ± terete; spathe spreading, subcoriaceous, green, linear-lanceolate, 4-9.4 cm long, 0.6-1 cm wide, broadest near the base, acuminate at apex (the acumen apiculate, occasionally cuspidate), narrowly acute to almost decurrent at base, the margins meeting at 20º angle; stipe 6-17 mm long in front, 1-2 mm long in back; spadix purplish becoming grayish to white, sometimes reported as green, oblong, weakly tapered, curved, 5-7 cm long, 3-4(5) mm diam. near base, 2-3 mm diam. near apex; flowers ± rhombic, (1.4)1.9-2.1 mm long, (1.1)2.4-2.6 mm wide, the sides smoothly to jaggedly sigmoid; 3-4 flowers visible in principal spiral, 4-6 in alternate spiral; tepals densely and conspicuously papillate to granulose, sometimes appearing glaucous; lateral tepals (1-1.7 mm wide, the inner margins broadly convex, the outer margins 2-3-sided; pistils slightly raised; stigma broadly ellipsoid, 0.3-0.4 mm long; stamens grouped in a tight cluster above the pistil; anthers 0.4-0.5 mm long, 0.3-0.5 mm wide; thecae oblong, slightly or not at all divaricate. INFRUCTESCENCE with spathe persisting, withered; spadix 7.5-9.8 cm long, 0.6-0.9 cm diam.; berries violet, ± ovoid, ca. 3.5 mm long, 3.4 mm diam.; seeds drying yellowish brown, ovoid, darker at the ends, ca. 1.7-2 mm long, 1.2-1.4 mm diam., 1mm thick.