Anthurium riojaense Croat

Hemiepiphytic climber; internodes 4.5 cm long, 6 mm diam., drying dark brownish grey, finely granulated, pale inclusions rarely dispersed; cataphylls 5.9 cm long, 7 mm wide, lightly dispersed-pale-lineate, abmptly acuminate at apex; petioles 25.2-37.5 cm long, 3-4 mm wide, drying dark-brownish yellow, D-shaped with 3 ridges adaxially; geniculum 15-17 mm long, 3-4 mm wide, drying dark brown, finely many-ribbed, moderately smooth; blades 26.3-34.3 cm long, 18.8-23.4 cm wide, 1.43 times longer than broad, sub-trilobate, abruptly acuminate at apex, deeply lobed at base, subcoriaceous, weakly bicolorous, drying weakly glossy, medium brown above, grayish yellow-brown below; upper surface moderately smooth, densely pale-lineate; lower surface moderately smooth, less prominent-densely pale-lineate; anterior lobe 17.4-25.4 cm long, 7.8-13.3 cm wide, abruptly concave near base, the constricted area 5.8-7.6 cm wide; posterior lobes 8.4-10.2 cm long, 8.0-9.4 cm wide, rounded at apex, 4.6-6.7 cm across the confluent area (from petiolar plexus to inner edge of confluence); concave toward base; basal veins 5-6 pairs, 15t pair free to base, 2nd fused 5-14 mm, yd fused 17-27 mm, 4th-6th fused 36-42 mm; posterior rib naked 16-26 mm; midrib narrowly rounded to bluntly acute, darker above, broadly rounded, minutely granular, pale-lineate, drying slightly darker than surface below; primary lateral veins 5-6 on both sides, arising at 50-53°, narrowly round-raised, bluntly acute, minutely granular; tertiary veins obscure above, slightly raised below; collective veins arising from 2nd-3rd primary lateral vein, 3-6 mm from margin. INFLORESCENCES erect; peduncle 11.2-14.5 cm long, 1-2 mm wide; spathe green, 5.8-8.6 cm long, 9-14 mm wide, 6.3 times longer than broad, abmptly acute at apex, erect-spreading, hooding spadix, slightly curved, green, drying yellowish brown; spadix 6.4-7 cm long, drying 4-5 mm diam., 13 times longer than broad, stipitate 4-5 mm, yellow, with slight aroma at anthesis; flowers 6 visible per spiral, 1.5-1.6 mm long, 1.4-1.5 mm wide, weakly 4-lobed; tepa Is minutely granular with pale inclusions, lateral tepals .4-.6 mm wide, inner margins rounded, outer margins 4-sided; stamens held in a contiguous cluster around stigma at level of tepals; anthers .5 mm long, .4 wide; thecae parallel.