Tuber short elongate, rarely branching, to 8 cm long, to 3 cm in diam. Leaf solitary; petiole terete, 25-30 cm long, 7-8 mm in diam., uniformly pale reddish brown; lamina 17- 20 cm in diam., main segments with few, relatively large leaflets, winged to the base. Leaflets elliptic-oblong, 6-11 cm long, 2.8-4.5 cm in diam., acute-acuminate, upper surface rich dark green, margin narrowly lined purplish-red, lower surface pale green, margin as upper surface. Inflorescence solitary; peduncle 20 cm long, 5 mm in diam., as petiole; spathe ovate, slightly concave, erect, 6 cm long, 4 cm in diam. greenish white all over, margins involute, apex acute, base within densely clothed with short, fleshy, complexly-branched verrucae. Spadix sessile, longer than spathe, 1l.5 cm.; female zone cylindric, 0.5 cm long, 0.7 cm in diam., flowers adjacent, not densely congested; male zone cylindric-conic, base slightly constricted, 3 cm long, 0.6 cm in diam. at the base, 0.5 cm at the apex, flowers congested; appendix 8 cm long, ca. 0.7 mm in diam., narrowly elongate conical, tapering from base to apex, laterally flattened, base slightly attenuate, apex narrowly obtuse, surface irregularly rugulose, pale yellowish green, emitting a strong smell of gas (oligomethyl-oligosulphides). Ovaries strongly depressed, 2.5-3 mm in diam., 1 mm high, pale green, bilocular; sty le 0.4 mm long, 1.5 mm in diam., white; stigma disciform, 2 mm in diam., 0.3 mm high, subentire to shallowly 4-5-lobed, grooves between lobes radiating from the centre, central depression slightly elongate, margin sometimes slightly notched and lobed-sinuous, surface minutely rugulose, white. Male flowers consisting of 2-5 stamens; stamens 1 mm high, 1-1.5 mm in diam., polygonal in cross-section; filaments ca. 0.5 mm long, fused, whitish; anthers ca. 0.5 mm long, truncated or slightly conical, pale greenish, pores apical, rounded or in the lowermost lunate to circular. Pollen striate.
Thailand, Nakhon Sawan and Kanchanaburi Provinces.