Arisaema yunnanense Buchet

Plants dioecious. Tuber renewed seasonally, pale brown outside, white inside, depressed globose or globose, 0.5-4 cm in diam., with some offsets above; offsets sessile, globose. Cataphylls 2, green, sometimes purplish, 3-25 cm, papery, apex obtuse. Leaves 1(or 2); petiole green, without spots, 40-70 cm, basal 2/3 sheathing into pseudostem, encircled by cataphylls; leaf blade green on both surfaces, 3-foliolate; central leaflet with petiolule 0-1.5 cm, blade elliptic, sometimes ovate, 10-19 × 5-12 cm, base cuneate or obtuse, apex acuminate; lateral leaflets sessile or shortly petiolulate, ovate to lanceolate, 9-15 × 5.5-9 cm, base obliquely cuneate. Peduncle emerging from pseudostem, green, without spots, longer (male) or shorter than petioles, 20-75 cm. Spathe green, with longitudinal white lines; tube 2-2.5 × 1-1.4 cm, throat margin obliquely truncate, not auriculate; limb arching from base, ovate, ca. 5 × 3.5 cm, apex acuminate. Spadix unisexual; female zone conic, ca. 1.5 cm; ovary green, obovoid; ovules 3, basal; style ca. 0.5 mm; stigma depressed globose; male zone pyramidal, 1.5-2 cm, base 3-5 mm in diam.; synandria of 2 or 3 stamens; thecae violet, globose, opening by an apical pore. Appendix recurved outward or downward, pale green, cylindric, narrowed distally, 3.5-6 cm, base 2-2.5 mm in diam., naked. Berries red, subcylindric. Seeds 2 or 3, ovoid-globose. Fl. May-Jul, mature fr. Aug-Sep. 2n = 48.