Arisaema exappendiculatum H.Hara

Tuber depressed globose, 2–5cm in diam., sometimes with thick creeping stolons. Cataphylls purple. Leaf solitary; petiole green, sometimes dark purple, 23–55cm, proximally sheathing into pseudostem; leaf blade radiate; leaflets 7–13, sessile, oblanceolate, 8–22 × 2–4cm, base cuneate, apex long acuminate. Peduncle green, sometimes purplish, much shorter than petioles. Spathe green, occasionally dark purple, slightly glaucous inside; tube pale green, without distinct stripes, cylindric, 2–7 × 1.2–2cm, not broadened nor spreading at throat; limb suberect, ovate-lanceolate, 8–15 × 2.5–3cm (at base), generally with inrolled margins, convolute, tapering into a long caudate apex 5–8cm. Spadix unisexual, 1.5–3cm including appendix; female zone ca. 1.2cm in diam. at base; ovary green, turbinate, slightly angular, apex apiculate; stigma small; male zone 7–8mm in diam. at base; synandria lax; anthers stipitate, circumscissile at apex. Appendix absent, or very rarely broadly cylindric, to 1.5cm.