Arisaema pianmaense H.Li

Plants dioecious. Tuber depressed globose, 3–4cm in diam. Cataphylls 2 or 3, whitish with purple spots, to 21cm, membranous, apex acute. Leaf solitary; petiole pale green, with purple spots, terete, 30–50cm, basal part forming pseudostem; leaf blade 3-foliolate; leaflets subsessile, abaxially grayish green and densely covered with matted hairs and sparse golden scales, adaxially green and with dense papillae; central leaflet elliptic, 15–35 × 8–19cm, base cuneate, apex acute; lateral leaflets obliquely ovate-oblong, outer base ca. 2 × as wide as inner side, rounded. Peduncle terete, 18–32cm. Spathe purple with whitish longitudinal lines; tube cylindric, 6–7 × 1.5–2cm, throat margins slightly recurved; limb obovate-spatulate, 7–8 × 4–5cm, apex abruptly acuminate with a tail 2–3cm, strongly downcurved. Spadix unisexual; female zone ca. 2.5cm; ovary pale green, subcylindric; stigma sessile, concave; appendix sub-sessile, purple, proximally narrowly conic, distally tapering and drawn into flagellum, in total 24–30cm, pendulous, base truncate; male zone ca. 2cm; synandria of 2 or 3 stamens, connected filaments distinct; anther purple, fused from 2 thecae, dehiscing by horseshoe-shaped slit.