Xanthosoma rubrispathum E.G.Gonc.

Helophytic herb, robust, 0.5 - 2.3 m tall, laticiferous, producing white latex when cut. Stem cylindric, 10 - 90 x 9 - 20 cm, covered by shredded leaf bases. Leaves glabrous, 3 - 7 per plant, petioles 40 - 170 x 1.2 - 3.5 cm, green and glaucous, sheath up half of the petiole, sheath usually reddish; leaf blade sagittate 47 - 110 x 43 - 76 cm, glossy to semi-glossy green adaxially, glaucous adaxially, anterior division 35 - 65 x 42 - 66 cm, 1.1 - 1.5 times longer than wide, apex acuminate, primary lateral veins 7 - 10 per side, diverging in a 75 - 85° angle, posterior division 23 - 30 x 43 - 76 cm, basal rib not denuded at all, acroscopic veins 4 - 6, basioscopic veins 8 - 10, apex of lobe round to obtuse. Inflorescences 1 - 3 per leaf axil, peduncle 6 - 16 x 1 - 2 cm, purplish and strongly waxy; spathe 31 - 37 cm long, tube ovoid 6 - 8 x 4 - 6 cm long, purplish red and strongly waxy outside, matte purplish red inside, lamina 21 - 23 x 8 - 10 cm yellowish strongly tinged with red inside, red tinged with purple outside; spadix 26 - 30 cm long, female portion conic, yellow 4 - 5 x 2 - 3 cm, sterile male almost monomorphic, purple, 7.3 - 8 x 1.8 - 2 cm, fertile male portion reddish, 17 - 18 x 1.7 - 2.1 cm. Flowers: female 3 x 2 mm, style discoid and coherent, ovary barrel shaped, 4-loculed, locules 10 - 14-ovuled inserted along the entire flower axis, staminodes elongate towards inflorescence apex, 8 - 10 x 1 mm, synandria 2 - 3 x 4 mm. Pollen grains shed in tetrads. Berry green, 5 - 6 x 2 - 4 mm, seeds 1 x 0.5 mm.