Arisaema ilanense J.C.Wang

Tuber depressed globose, 1.3–3cm in diam. Cataphylls 3–5, whitish to greenish, fleshy, apex mucronate. Leaves 2; petiole terete, 20–55cm, basal 10–30cm sheathing and forming pseudostem; leaf blade pedate; leaflets 7–15, sessile, oblanceolate to elliptic, base cuneate, apex acuminate; central one 10–22 × 2–4.5cm, longer than or equal to adjacent one. Peduncle 11.5–37cm, free part 1.5–7cm, usually much shorter than free part of petiole. Spathe tube pale to greenish yellow outside, dark purple inside, gradually becoming pale to reddish brown proximally, cylindric, slightly auriculate at throat, 6–9 × 1.3–2cm; limb pale greenish yellow outside, dark purple inside, ovate, 6–10 × 3–5cm, apex acute or sometimes acuminate. Spadix unisexual, 1.5–2.4cm in male, 1.5–3.4cm in female. Appendix distinctly exserted from spathe tube, proximally reddish, distally dark purple to black, clavate, 9–15cm, proximally gradually narrowed toward floriferous part or sometimes stipitate at base with some echinate neuter flowers, distally bent outward or slightly downward.