Tuber subglobose, up to ± 8 cm. in diameter.. Leaf 30–95 cm. long, shortly pilose to glabrous; petiole not distinctly developed; leaflets extending to ground-level; subterranean axis slightly thicker, forming basal cylindric pulvinus; blade oblanceolate in outline, 12–40 cm. broad at widest point, pinnately to bipinnately lobed; pinnae borne in opposite pairs; basal pairs reduced to tufts of oblanceolate to linear, long-stipitate foliar projections; ultimate leaflets of larger pinnae elliptic to oblanceolate, 6–20 cm. long, 2.5–6 cm. broad, glossy dark green on upper surface, shortly acuminate, those of large central pinnae decurrent, simple apical pairs cuneate, sessile or shortly petiolulate.. Inflorescence solitary.. Peduncle 9–42 cm. long, 0.5–0.8 cm. in diameter, erect, terete, minutely pilose.. Spathe 5–17.5 cm. long; tube broadly suburceolate, only slightly constricted at mouth, widely distant (by 3–5 mm.) from pistillate flowers, 1.5–3 cm. long, 1.3–2.7 cm. in diameter; limb oblong to oblong-elliptic, 3.5–14.5 cm. long, 2.2–5 cm. broad, reflexed, bright green, paler within, cuspidate, outer surface sometimes shortly pilose.. Spadix 4.7–15 cm. long; staminate part cylindric to clavate, 3.2–11.5 cm. long, 0.7–1.1 cm. in diameter, cream, apex rounded, base slightly constricted; sterile intermediate part 0.2–0.4 cm. long, 0.3–0.8 cm. in diameter at narrowest part; pistillate part cylindric, 1–3 cm. long, 0.6–1.3 cm. in diameter.. Pistillate flower with pale green tepals; ovary 2-locular, locules uniovulate, placentas at base of septum; stigma capitate-discoid, 1.5 mm. in diameter.
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