Amorphophallus laoticus Hett.

Tuber elongate, thin, to ca. 30 cm long, ca. 3 cm in diam. Leaf solitary, petiole 55-80 cm long, 1-2 cm in diam., smooth but epidermal cells distinctly sharp conical providing the petiole with a satiny sheen and a slightly papery touch, background blackish grey or dark reddish brown with many scattered, irregular, pale grey spots and numerous tiny, pale grey dots; lamina 72-100 cm wide, rachises narrowly winged throughout; leaflets elliptic-lanceolate to lanceolate, narrowly acute, 14-20 cm long, 2-4 cm wide, upper surface deep velvety green with a broad grey zone along the midrib. Inflorescence solitary, long peduncled; peduncle 25-50 cm long, 1-1.8 cm in diam. as petiole; spathe broadly elongate triangular, acute, 10-33 cm long, 10-37 cm in diam., base and limb separated by a strong constriction, base outside pale green with scattered, linear, whitish spots, inside dark purple, limb oblique, strongly arching forward at male anthesis, outside along the centre strongly costate, colour as base but margins flushed dirty purple, inside dull dark purple, margin slightly undulate, base within strongly papillate-verrucate, verrucae often narrowly muricate or partly confluent and ridge-like. Spadix longer than spathe, sessile, 18-90 cm long; female zone cylindric, 4 cm long, 1-3 cm in diam. (incl. styles), flowers slightly distant; male zone elongate, slightly fusiform, 2.5-7.5 cm long, 1-2.8 cm in diam., flowers congested, with or without scattered hair-like staminodes in between the functional flowers; appendix elongate fusiform-conic, acute, 10-79 cm long, 0.8-2.5 cm in diam., smooth or with scattered, hair-like staminodes, glossy dark purple. Ovary depressed, lower half sunken in pocket in spadix-axis, elliptical in cross-section, l.5 (short axis)-3 (long axis) mm in diam., 2 mm high, base white or pale green, apex dark purple, bilocular; style long, thin, 3.5-4 mm long, 0.8-1 mm in diam., dark purple; stigma large, 2 mm in diam., 2 mm high, laterally depressed and apex depressed, very shallowly bi-lobed, lobes rounded, surface densely scabrate, white or dirty pale brown. Male flowers consisting of (2-)3-5 stamens; stamens 1.5 mm long; filaments 0.5 mm long, connate, whitish; anthers truncate, ca. 1.5 mm in diam., ca. 1 mm long, glossy dark purple, connective with a longitudinal groove. Staminodes hair-like, to ca. 1 cm long, dark purple. Infructescence with fruiting part cylindric, 15 cm long, 4 cm in diam., berries crowded. Berries globose or laterally depressed, ca. 1 cm long, 0.7-1 cm in diam., yellow. Pollen psilate.