Anthurium chamberlainii Mast.

Stems to less than 1 m long; internodes short, to 4 cm diam.; cataphylls to 20 cm long, persisting as a network of reddish brown  fibers; petioles 150 cm long, erect-spreading, subterete, unribbed, smooth geniculum 6 cm long, slightly thicker than petiole, tinged conspicuously with red; blade ovate-triangular-sagittate, 95 cm long, 70 cm wide, 1.4 times longer than wide, dark green and semiglossy above, moderately paler and semiglossy below, short-acuminate at apex, deeply lobed at base; margin broadly undulate more or less throughout; anterior lobe weakly concave and broadly convex along margins; posterior lobes 22 cm long, 25 cm wide, directed inward and held somewhat erect in live condition; sinus hippocrepiform, 11 cm deep, 18 cm wide, closed and subreniform when closed, more or less rounded at apex; major veins narrowly rounded, unribbed, moderately paler than the surface; basal veins 9-10 pairs, 1st pair free to the base, 2nd pair fused 5.5  cm, 3rd pair fused 8-8.5 cm, 4th pair fused 12-12.5 cm, 6th & 7th and higher order pairs fused 15 cm, 8th & 9th fused to 16-17.5 cm; posterior rib weakly moderately curved, especially toward the apex 17.5 cm long, naked along the sinus for most of its length, to 15 cm; primary lateral veins 7-8 pairs, arising at a 45-50° angle; collective veins arising from the 4th pair of basal veins, but weakly loop-connecting from 6th pair of basal veins, (2-)5-10 mm from margin; tertiary veins moderately obscure, weakly raised upon drying. INFLORESCENCE erect spreading; peduncle 60 cm long, 1.3 cm diam.; spathe 20-21 cm long, 10-11 cm wide when flattened, hooding, spreading forward at ca. 120° from peduncle, naviculiform, prominently attenuated at apex, reddish in bud, reddish violet except light greenish along margin at anthesis outside, reddish violet except thin, light greenish margin inside; spadix stipitate (stipe 12 mm long, 9 mm diam., whitish except pinkish at apex) 24.8-26 cm long, 3 cm diam. (drying to 1.8 cm diam.), oblong-fusiform, orangish red (drying reddish brown), directed mostly downward and an angle of 90°, gradually tapered to apex, narrowly rounded at apex; flowers 12-15 visible per spiral, 3.2-3.5 mm long, 1.8-2.1 mm wide; tepals drying medium reddish brown, matte, conspicuously granular; lateral tepals 1.8-2 mm, inner margin broadly rounded, outer margin 2-sided; stamens whitish, protruded at anthesis and persisting to ca. 3 mm above tepals; anthers 1.8-2 mm long, 0.6 mm wide; pollen yellow.