Amorphophallus corrugatus N.E.Br.

Tuber globose to subglobose, 2–12 × 2–10 cm high, developing seasonal offsets; offsets long, rhizomatous, slender, ca 9 cm × 8 mm, not apically thickened. Leaf solitary; petiole slender 10–95 × ca 2 cm, shallowly, longitudinally ridged, ground colour dirty white or pale green with a very faint, pale brownish hue overlain with numerous, tiny and fewer large, partly confluent, irregular, dark chocolate-brown or greyish spots; leaf blade moderately dissected, 10–150 cm diam., rachises only winged in the distal third; main segments subdichotomous; leaflets oblong or lanceolate, acuminate, base long-decurrent in the most distal ones, others narrowly sessile, 10–28 × 4–9 cm, adaxially green. Inflorescence long pedunculate; cataphylls to 40 cm long; peduncle 30–70 cm × 8–20 mm, appearance as petiole; spathe ovate or elliptic-ovate, concave, acute or obtuse, base shortly convolute, 7–26 × 4–16 cm, exterior pale greenish, greyish purple or white, sometimes to the base with whitish spots, or with grey-green or pale olive-brown spots, either only the margin purplish red or also large parts reddish brownish, interior pale greenish whitish with several irregular, purplish red spots and a purplish red margin, base within often purplish red, or the utmost base whitish, surface smooth; spadix much shorter than spathe, 4–11 cm, stipitate; stipe 2–15 mm long, slender, white or with some pale brownish spots and a pinkish hue; pistillate flower zone cylindrical or slightly obconical, 1.3–3.5 cm × 8–20 mm, flowers congested; ovaries globose, depressed or subpyriform, circular, diamond-shaped or irregularly angular in cross-section, 1–2 × 1.5–2(–3) mm , more or less gradually tapering to the style but after fertilisation developing an annular articulation, dark purple with pale whitish green base, unilocular, occasionally bilocular, 1 basal ovule per locule; style slender, cylindrical or slightly conical, straight or more or less strongly curved towards the spadix-axis, apex oblique and sometimes tricuspidate or drawn out in a slender point reaching beyond the stigma, entirely dark purple or the upper half bright pale green, 2–4 × 0.8 mm (base); stigma subapical or lateral, superficial or subcapitate, usually transversely bilabiate, rarely longitudinally oval, surface shallowly but densely verrucate or echinate, occasionally with elongate, fleshy, conical verrucae, pale yellowish or dirty whitish, 0.2–0.5 × 0.5–1 mm; staminate flower zone cylindrical to fusiform-obconical, 1.3–4 cm × 7–22 mm, flowers densely congested; staminate flowers 3–5-androus; stamens 3–3.5 mm long; filaments 1.8–2 mm long, the lower half connate, whitish; anthers elongate, subquadrangular or strongly biconcave in cross-section, whitish, pinkish or flesh-coloured, 1.3–1.5 × 1–1.3 mm, apex truncate, connective massive, pale violet; pores transversely elongate, lateral; appendix hardly to distinctly stipitate, globose, ovate, elliptic or conical, obtuse or truncate, at first turgid but during pistillate anthesis weakening quickly and soon shrivelling and drying, turning brown, 1–5 × 1–3 cm, surface with several irregular grooves (not associated with staminodes), the longitudinal ones deepest, in between usually with a complex and dense pattern of elongate, convoluted staminodes, separated by narrow grooves, the whole appearing brain-like, yellowish white or pale greyish green, occasionally with a pale violet hue; stipe of appendix cylindrical or obconical, 1–6 × 0.3–1 cm. Infructescence cylindrical, ca 4 × 2 cm; fruit ellipsoid, maturing orange.