Arisaema penicillatum N.E.Br.

Tuber globose, 1–2(–3)cm in diam. Cataphylls lanceolate, ca. 8cm. Leaves 2; petiole 25–30cm, below middle sheathing into pseudostem; leaf blade 3-foliolate; central leaflet petiolulate, elliptic, ca. 14 × 6cm; lateral ones subsessile, shorter than terminal, oblong-lanceolate, ca. 10 × 4cm, base oblique, apex acuminate; collective vein 0.3–2mm from margin. Peduncle as long as or longer than petioles. Spathe tube pale green, cylindric, 4–6 × 1.2–2cm, throat margins spreading but not re-curved; limb transversely demarcated between proximal white part and distal green part, oblong, 2–5cm, apex acuminate with tip. Spadix unisexual. Female spadix: female zone green, pyramidal, ca. 1.5cm; ovary ovoid; ovules 5, apex constricted into a short style; stigma capitate; appendix green, narrowly cylindric, 4–5cm × 2–3mm, base ca. 2cm and apex 8–10mm, covered with broadly filiform neuter flowers (1.5–2mm). Male spadix: male zone narrowly conic, 3–4cm, with sparse male flowers; synandria of 3 stamens; anthers ovoid, opening by longitudinal apical slits; appendix filiform, 3–4cm, at apical 1–1.5cm covered with filiform or subulate neuter flowers (1–2mm).