Arisaema jacquemontii Blume

Tuber subglobose, 1.2–3cm in diam. Cataphylls 1 or 2, whitish, occasionally brown, to 20cm, membranous, apex acute or obtuse. Pseudostem, petiole, and peduncle pale green, unmarked. Leaves 1 or 2; petiole (2.5–)20–52cm, proximal 4/5 sheathing and forming pseudostem; leaf blade palmate; leaflets 5(or 7 or 9), sessile, ovate, oblong, or lanceolate, base attenuate, apex acuminate; central leaflet 7–18 × 2.5–7 cm; lateral leaflets 3–7 × 0.8–2.5m. Peduncle as long as petioles. Spathe green outside, greenish inside; tube cylindric, 2.5–8 cm × 8–20mm, throat obliquely truncate, not recurved; limb arching over spadix, ovate to narrowly ovate or oblong-triangular, 2.5–5(–9)× 1–2.5(–3.5)cm, apex acuminate into ascending filiform tail 2.5–6cm. Spadix unisexual; female zone 1.5–3 cm × 5–7mm; ovary greenish, narrowly ovoid; stigma spherical; male zone cylindric, 2–3 cm × 3–3.5mm; synandria sessile, lax, cream-colored or tinged dark purplish; anthers 2–4, dehiscing by apical pores or slits. Appendix greenish proximally, purplish distally, 2–8cm × ca. 1mm, distal part emergent from spathe tube horizontal to decurved, tapering, base swollen, truncate to 3–5mm in diam., shortly stipitate, smooth. 2n = 52.