Xanthosoma hebetatum Croat & D.C.Bay

Terrestrial; stem to 1 m tall, sap milky, becoming amber in age; internodes 1.5–5 x 6 cm, fissured both horizontally and longitudinally, dark brown, drying dark brown; cataphylls deciduous but persisting at bases, fibrous. LEAVES erect-spreading; petioles 56–77 cm, terete, obtusely flattened adaxially, somewhat spongy, medium green, faintly pale-speckled, drying dark brown, sheathed ca. 1/3 of their length; blades ovate, acuminate at apex, subhastate at base, thin, 45–62.5 x 26–33.5 cm, 1.7–1.9 times longer than wide, 0.8–0.9 times longer than petiole, subcoriaceous to thinly coriaceous, moderately bicolorous, upper surface semiglossy, dark green, drying semiglossy, dark olive-green, lower surface matte to weakly glossy below, paler than above, drying glossy, light olivegreen; anterior lobe 1.6–1.8 times longer than posterior lobes; posterior lobes rounded to acute at apex, directed slightly outward; major veins obtusely sunken, concolorous in life and dry above, roundraised to C-shaped, paler than surface, drying slightly raised, darker than surface below; basal ribs naked to 3 cm; primary lateral veins usually 5 per side, departing midrib at 50^o–60^o angles; collective veins 2, one submarginal, one ca. 5 mm from margin; minor veins prominulous, darker than surface, the larger ones raised below. INFLORESCENCES with peduncle 13–14.5 cm, somewhat compressed, pale green, drying 5–7 mm wide; spathe 22–22.5 cm, the blade creamy white, ca. 4 cm wide at anthesis, the tube uniformly light green outside, pale greenish inside; staminate spadix and pollen cream-colored; pistillate portion yellowish, 5.8 cm, 0.7–1.3 mm diam.; staminate spadix 13.5–14 cm, the sterile portion 5 cm, ca. 1 cm diam., with thickened flowers at the base (these 3–4 6 1.2–1.6 mm), constricted to 5 mm diam. toward the apex; fertile portion 8.5–9 cm, drying 9–10 mm wide, bluntly pointed at the apex. INFRUCTESCENCES 1 per axil, erect, to 6 6 3.5 cm (dry); peduncle to 8 cm, pale green; spathe tube light green outside; berries greenish white; seeds cream-white, 0.7–1.1 6 0.6–1 mm, pyramidal with 9 acute longitudinal ridges or lemon-shaped with 12 acute longitudinal ridges.