Cyrtosperma brassii A.Hay

Robust herb to 2.5 m high. Leaves 2-several; petioles spreading out from the base, very prickly with small spines arranged in combs at least towards the base, mottled green and white; lamina sagittate, to 120 cm long, held with the anterior lobe up, the posterior ones down; costae of the anterior lobe pinnate, spreading; posterior lobes with the midribs naked in the sinus for c. 6 cm, to 30 cm wide at the widest point, with acuminate tips; upper and lower surfaces of the lamina asperous in the dry state (not so when fresh); peduncle similar to but usually somewhat shorter than the petioles. Spathe ovate lanceolate, to 18 cm long, remaining somewhat constricted above the level of the apex of the spadix after opening, boat-shaped, blackish purple, with parallel major venation, secondary venation reticulate; spadix with a c. 5 mm long free unarmed stipe, to c. 7 cm long, creamy yellow. Flowers tetramerous; ovaries 1 (-2)-ovulate; anthers exserted from the tepals at male anthesis; fruit ovoid, orange-red. Seed smooth, very faintly longitudinally ridged.