Amorphophallus plicatus Bok & H.J. Lam
Protologue: Blumea 2 (1936): 33
Tuber depressed globose, to c. 13 cm in diam., c. 8 cm high, no offsets, whitish. Leaf unknown. Inflorescence short peduncled. Peduncle c. 6 cm long, 1 cm in diam., dark grey with a few raised white spots. Spathe broadly campanulate, 18-25 cm long, 28-36 cm in diam., base and limb separated by a shallow constriction, base outside pale green with a few scattered, irregular, whitish spots, inside lower part purple, remaining part dirty off-white with a very faint pale green flush, limb outside dirty pale green with a few indistinct whitish spots, towards the margin turning brownish green, semi-glossy, inside glossy dark purple, margin involute, strongly and irregularly plicate-undulate, sometimes (?) laciniate, base within densely ridged-verrucose. Spadix sessile, much longer than spathe, 45 48 cm long. Female zone slightly conic, 5-5.5 cm long, 4 cm in diam. at the base, 2.5-2.8 cm in diam. at the top; flowers congested. Male zone cylindric, 4-5 cm long, 2-2.5 cm in diam., base slightly constricted; flowers congested. Appendix narrowly elongate, 36-38 cm long, c. 2 cm in diam. at the base, tapering to the top, acute or subacute, surface of lower half irregularly, shallowly grooved. Ovaries ellipsoid-oval, c. 3 mm long, c. 2 mm in diam., circular in cross-section, basal half white, upper half dark purple. Style slender, 3-4 mm long, c. 0.5 mm in diam., dark purple. Stigma conical, entire or shallowly bilobate, 1-1.5 mm in diam., 0.7-1 mm high, often laterally displaced, circular in cross-section, surface densely echinulate, dirty pale greyish-brown. Male flowers consisting of 3-5 stamens. Stamens to 3 mm long. Filaments c. 1 mm long, lower part connate, whitish. Anthers subtruncate, c. 2 mm long, c. 1.5 mm in diam., off-white to pale greyish.
Endemic to North Sulawesi. Found in Panua Nature Reserve and Bolaang Mangandow Natural Reserve
Habitat: Secondary forests, in somewhat open area with good drainage, 140-750 m altitude.
Notes: Amorphophallus plicatus is an endangered Sulawesi species, with a very small area of distribution and is apparently declining in its natural habitat.