Arisaema mooneyanum M.G.Gilbert & Mayo

Robust, perennial, tufted herb to about 50cm tall. Tuber discoid to depressed-globose, about 5 cm diam., with numerous subsidiary tubers on the margins. LEAVES 1-2, subtended by 1-2, oblong to lanceolate, yellowish-green cataphylls, drying brownish. Petiole uniform green throughout with short pseudostem, free apical part of petiole 17-30 cm long. Leaf blade radiately divided to base, circular in outline; leaflets (6)8-12, subequal in size, ob-lanceolate to broadly elliptic, 6-5-26 x 1-5-6-5 cm, long-acuminate, base cuneate, margins entire or serrulate with basal teeth to 1 mm long. INFLORESCENCE usually overtopping the leaves, larger central shoot with female or bisexual inflorescence, often surrounded by several smaller male inflorescences from lateral shoots. Free part of peduncle 10-20 cm long, green or suffused with maroon towards apex, up to 1 -5 cm in diam. Spathe 16-39 cm long; tube cylindric, not constricted apically, 6-5-13 x 1-3 cm, outer surface glaucous, greenish-yellow, sometimes heavily suffused with purple; limb ovate, broadly auriculate at base with revolute margins, 10-25 x 3-7-9 cm, curved forwards from 90° to 180° to tube, long-acuminate, both surfaces glossy, brown or very dark purple to almost black at the base, upper part olivaceous with fine, dark brown veins. Spadix unisexual or bisexual, 8-17 cm long, longer than spathe tube; sterile appendix subcylindric and somewhat flattened, 4-5-10 x 0-6-1-5 cm, apex rounded, base gradually narrowed to sharply truncate with distinct stipe, bright yellow at tip, often with brownish band at level of spathe mouth; fertile part very variable, 2-9 x 0-5-2 cm. Flowers of both sexes congested to ± distant; staminate flower usually composed of 2, sometimes 3 stamens, anthers dehiscing by oblique apical slits; pistils flask-shaped, 2-5-5 mm long, ovary green, stigma small, capitate, paler. FRUIT unknown.