东北南星 dong bei nan xing

Arisaema amurense var. robustum Engler; A. amurense var. violaceum Engler.

Tuber depressed globose, 6-7 cm in diam. Leaves 2(or 3); petiole (5-)7-30 cm, proximal 3/4 sheathing and forming pseudostem; leaf blade 3-foliolate or pedately 5-foliolate; rachis between leaflets 0-6 cm; leaflets sometimes covered with fine whitish marks, obovate to narrowly oblong, 7-11 × 4-7 cm, base cuneate, margin entire or serrate, occasionally denticulate, apex acute; central leaflet with petiolule 5-25 mm; lateral leaflets remote from central one for 1-30 mm; outermost leaflets sessile, 9-15 cm, oblique, cuneate at base on inner side, auriculate or rounded on outer side. Peduncle shorter than petioles. Spathe greenish to dark purple, usually with pale purplish stripes; tube funnelform to cylindric, ca. 5 cm, ca. 2 cm in diam. at throat, throat obliquely truncate, not auriculate; limb ovate-lanceolate to oblong, 3-4 cm, apex acuminate. Spadix unisexual; female zone subconic, ca. 2 cm, ca. 1 cm in diam. at base; ovary obovoid; ovules 4; stigma spherical; male zone cylindric, ca. 2 cm × 2-3 mm; synandria lax, nearly sessile; anthers 2 or 3; thecae globose, dehiscing by apical pores. Appendix stipitate, erect, cylindric and robust, 3-5.5 cm × 4-5(-7) mm, base truncate, apex obtuse. Berries red, narrowly conic. Seeds 4, red, ovoid, smooth. Fl. May, mature fr. Sep. 2n = 28, 56.

Deciduous forests, mixed forests, woods, by streams; below 100-200 m. Hebei, Heilongjiang, Henan, Jilin, Liaoning, Nei Mongol, Ningxia, Shandong, Shanxi [Korea, Russia (SE Siberia)].