Arisaema nanjenense T. C. Huang & M. J. Wu; A. quinquefoliolum Hayata.

Rhizome oblong-ovoid, 3-5 × 1.5-2.2 cm. Leaves 2(or 3); petiole 18-30 cm, proximal 13-25 cm sheathing into pseudostem, dull purplish green, mottled with dark purple and orange, surrounded by several cataphylls; leaf blade 3- or 5-foliolate; leaflets base rounded to cuneate, margin entire, apex acute to acuminate, often mucronate at tip; central leaflet with petiolule 1-2.5 cm, blade elliptic to lanceolate; lateral leaflets with petiolule 3-10 mm, blade lanceolate to oblong, oblique at base. Spathe greenish on both surfaces with a semilunate white spot in throat; tube cylindric, (3-)4-6 × 1-1.7 cm; limb triangular-ovate, 1.5-2 cm wide, apex acute. Spadix bisexual in mature plants; female zone ca. 2.5 cm × 5 mm; ovary obliquely conic-ovoid; stigma subsessile, pilose; ovules 4; male zone ca. 1.8 cm × 4-5 mm; synandria lax, of 3 stamens; anthers dehiscing by 2 apical pores; appendix narrowly pyramidal, 6-7 cm, distal part filiform and weakly curved, distal 1.2-2 cm covered with filiform neuter flowers ca. 3 mm. Berries red, conic-ovoid. Seeds 2 or 3, cream-yellow spotted with dark purple. Fl. Mar, fr. Jul.

● Low to middle elevations. S Taiwan.