Amorphophallus arcuspadix
Tuber subglobose, or slightly depressed, 4-5 cm in diam., 2.5 cm high, brown, seasonally producing rhizomatous offsets, these up to 18 cm long and 0.6 cm in diam.. Leaf solitary; petiole 20-30 cm long, 0.5cm in diam., pale green, or pale brownish green; lamina moderately dissected, up to 40 cm wide, rachises narrowly winged; leaflets elliptic, tip acuminate, base decurrent, 5-15 cm long, 2-7 cm in diam., upper side medium green, lower side paler. Inflorescence solitary, long pedunculate; peduncle 40-45 cm long, ca. 0.7 cm in diam., faintly longitudinally ridged, pale green or pale pinkish green; spathe ovate, 8-9 cm long, 3.5-4 cm wide, outside pale green, margins whitish green, inside pale green, base inside smooth, top broadly acute. Spadix slightly shorter than spathe, sessile, 7.5 cm long, during male anthesis upper part arches downward to position below female zone, sometimes stipitate, stipe up to 0.5 cm long, pale green to white; female zone cylindric, 1.25 cm long, 0.75 cm in diam., flowers congested; male zone cylindric, 5 cm long, 0.6 cm in diam., lowermost flowers somewhat free or irregularly chained, remaining flowers in a helix or separate verticils somewhat congested, during male anthesis interstices between verticils becoming elongate and appear exposing naked white spadix axis; appendix conic, top obtuse or subacute, densely verrucose base consisting of 1-3 verticils, top congested, 1 cm long, base 0.75 cm in diam, top 0.4 cm in diam. Ovaries depressed, circular or angulate in cross-section, ca. 1.5 mm high, ca. 2 mm in diam., pale green, unilocular; Style ca. 0.5 mm long, ca. 0.4 mm in diam.; Stigma disciform, circular in cross-section, ca. 0.3 mm high, ca. 1 mm in diam., entirely or shallowly 2-5 lobed, verruculate greenish-white. Male flowers consisting of 3-8 stamens but the upper flowers laterally chained in a helix or verticils of 2 rowed-anthers; Stamens ca. 3 mm long, creamy-white, turning to pale yellow at male anthesis; filament ca.1.8 mm long, connate in individual flowers into a thick, obconical column, ca. 2 mm in diam., in verticils also connate with neighboring flowers; anthers truncate, ca. 1.2 mm long, ca. 1.3 mm in diam.; pores apical, rounded or oval at anthesis; connectives sunken.
Only known from the type locality.