Arisaema parvum N.E.Br. ex Hemsl.

Plants dioecious. Tuber globose, 1.2–1.8cm. Cataphylls 3–4.5cm, acute. Leaf solitary; petiole green, 6–18cm, smooth, base forming pseudostem; leaf blade 3-foliolate; central leaflet obovate or obcordate, 1.8–5.5 × 2–6cm, base cuneate usually with red margins, apex truncate or concave, with a short acumen; lateral leaflets obliquely ovate, 3–8 × 3–7cm, acuminate. Peduncle green, shorter than petioles, 5–12cm, smooth. Spathe tube color rather demarcated between dark purple (or dark carmine) proximal part and greenish distal part with whitish stripes, cylindric, 1.5–3.5 × 1.3–1.5cm, throat obliquely truncate, not recurved; limb greenish, broadly lanceolate, 3–6 × ca. 3.5cm, apex acute or acuminate, incurved. Spadix unisexual; male zone ca. 6mm; synandria stipitate; anthers usually 2, yellow, dehiscing by horseshoe-shaped slit; appendix shorter than spathe, 5–6cm, slender, base suddenly expanded into a disk, stipitate, distally recurved. Female spadix unknown.