Xanthosoma atrovirens K.Koch & C.D.Bouché

Herb up to 1.8 m tall, robust. Stems hypogeous or occasionally epigeous, rhizomatous, cylindrical, up to 26 cm in diameter and sometimes up to 30 cm tall, densely covered by brown fibers, producing sparse turbinate cormels. Leaves 3-5 per plant; petioles 70-103 cm long, blackish-green, conspicuously waxy, slightly reddish at base, sheathed up to 1/3 of its length, sheath revolute; leaf blade 49-90 x 34-53 cm, cordate in young individuals, cordate to subhastate in mature plants, semi-matte blackish green abaxially, medium glossy green abaxially, primary lateral veins 8-10 per side, arising at an angle of 75-85°, slighly discolorous adaxially, concolorous abaxially, apex acuminate; basal ribs denuded for 0-1.5 cm, basal lobes turned backward or slightly extrose, round at apex. Inflorescences 1-3 per axil, peduncle 50-80 x .5-0,8 cm; spathe 30-36 cm long, tube 7-9 x 4-6 cm, blackish-green outside, white inside, lamina 15-18 x 6-9 cm long, yellowish-white on both sides; spadix 20-28 cm long, fertile male portion yellowish-white 10-12 x 1-2 cm, sterile male portion 5.5-6 x 1.5-2.5 cm, white, moderately dimorphic, female portion conoid, 5-6 x 1-1.5 cm, bright yellow.