Arisaema sinii K.Krause

Plants dioecious. Tuber depressed globose, ca. 2 × 1.5cm, renewed seasonally, proceeding from a whorl of roots and a few globose offsets at apex around shoot. Cataphylls 2 or 3, whitish green, 5–12cm, membranous, apex acuminate. Leaves 1 or 2; petiole light green, unspotted, 20–30cm, basal 10–12cm sheathing into pseudostem; leaf blade glaucous abaxially, green adaxially, 3-foliolate; leaflets sessile, apex acuminate, with a short tail at tip; collective vein distinct, 3–7mm from margin; central leaflet rhombic, 8–15.5 × 6–13cm, base cuneate; lateral leaflets obliquely ovate-rhombic, 9–18 × 6–11cm, base obtuse on outer side, attenuate on inner side. Peduncle emerging from pseudostem, green without spots, 21–25cm, shorter than petioles, curved forward after flowering. Spathe pale green; tube white at base, funnelform, 3.3–5cm × 10–15mm, throat margins auriculate, recurved outward; limb arching forward and downward, ovate, 4–6 × 2.6–3.9cm, with longitudinal white lines inside, apex occasionally with a tubular tail 5.5–7.5cm. Spadix unisexual. Female spadix: female zone green, conic, ca. 15 × 8mm; ovaries densely distributed, globose; stigma sessile and rounded with serrate margin; appendix sessile, erect, pale green, cylindric, ca. 2.5cm × 3.5mm, attenuate to base, usually with a few subulate neuter flowers ca. 3mm at base. Male spadix: male zone 1–1.5cm; synandria of 2 or 3 stamens, violet; thecae globose, dehiscing by apical pore; appendix as in female spadix, erect, 2.2–3cm, without neuter flowers. Infructescence curved forward or pendulous.