Alocasia hypoleuca P.C.Boyce

Very large to massive, pachycaul, evergreen herb to 3 m with clear latex. Stem erect to ca 2 m or more, slender and self–supporting, very seldom decumbent. Leaves several together, clustered at the tips of stems of larger plants; petioles to 0.75–1 m long, sheathing in lower 1/3–¼; leaf blade ovate-sagittate, bluntly triangular in general outline, held more or less erect, ca 100 × 50 cm, light green adaxially, conspicuously glaucous abaxially; primary lateral veins on each side of the anterior costa diverging at ca 60º; axillary glands of primary veins distinct; secondary venation flush with the blade, forming poorly defined interprimary collective veins; posterior lobes ca 1/3–½ the length of the anterior, somewhat rotund, naked in the sinus in adult plants, peltate in juveniles. Inflorescences paired among the leaf bases, subtended by membranous cataphylls; peduncle barely exceeding the cataphylls at anthesis; spathe ca 24–26 cm long, constricted about ¼ of the way from the base; lower spathe ovoid, glaucous yellow-green; spathe limb narrowly oblong-lanceolate, 20–22 cm long, hooded at anthesis, remaining hooded and then marcescent, pale green, conspicuously glaucous internally, less so externally; spadix slightly shorter than the spathe, weakly glaucous, sessile; pistillate flower zone ca 3 × 1.5 cm; ovaries globose, ca 2.5 mm diam., mid-green, stigma sessile, 3-lobed, the lobes blunt, deeply incised and erect, deep yellow; sterile interstice approximately twice the length of the pistillate flower zone, white, conspicuously narrowed corresponding to the spathe constriction; synandrodia elongated rhombo-hexagonal, ca 5 × 2 mm, the lower ones prismatic and not connate and thus staminodial, distinctly raised, proximally ivory and slightly glaucous, synandrodes on the main, narrowed part of the interstice white; staminate flower zone cylindrical, ca 8 × 1 cm, dirty whitish cream, slightly glaucous; synandria 3–5 androus, rhombo-hexagonal, synconnective flat, ca 1 × 2 mm; appendix less than the length of the spadix, very slightly thicker than the staminate zone at the base, then tapering, with conspicuous brain-like patterning of longitudinal grooves, pale cream. Fruiting spathe ovoid, ca 6–9 cm long, green; fruit not seen.