Arisaema cochinchinense Blume; Pinellia cochinchinensis (Blume) W. Wight; P. tuberifera Tenore var. pedatisecta (Schott) Engler; P. wawrae Engler.

Tuber subglobose, to 4 cm in diam., with some surrounding tubercles. Leaves 1-3 or more; petiole greenish, 20-70 cm, proximally sheathing; leaf blade pedate; leaflets 6-11, sessile, lanceolate, base cuneate, apex acuminate; central leaflet 15-18.3 cm, following ones smaller; outermost ones 4-5 cm; primary lateral veins 7-12 per side, forming an inner collective vein and an outer second collective vein near margin. Inflorescence including peduncle 20-50 cm, green; peduncle to 35 cm. Spathe slightly convolute at base, green outside, greenish to whitish inside, lanceolate in total, not constricted between tube and limb, inside transverse septum absent, 10-19 × 1.5-2 cm, apex long acuminate. Spadix 14-20 cm; female zone 1.5-3 cm, adnate to spathe; female flowers very densely arranged; pistil 2.1-2.2 mm; ovary green, obovoid, ca. 1.9 × 1.2-1.3 mm; stigma subsessile, white, spherical, papillose; sterile zone between female and male flowers short, 4-5 mm; male zone cylindric, 5-8 mm; thecae yellow, elongate, ca. 1.3 mm, opening by a slit; appendix suberect, greenish to whitish, ± cylindric, 10-15 cm, 2-3 mm in diam. at base, distally becoming filiform. Berries pale to whitish green, ovoid, 4-5 × 3-5 mm, 1-seeded. Seed brown, obovoid, ca. 3.5 × 2.5 mm; funicle robust. Fl. May-Jun, fr. Jul-Sep. 2n = 26*.

Pinellia pedatisecta is the only species of Pinellia with always pedate leaf blades and lacking the transverse septum inside its spathe. It is easily distinguished from other species by having a spathe lacking a constriction between the tube and blade.

The poisonous tubers are used in medicine for treating enlarged lymph nodes and urinary tract infections.

● Forests, valleys, shaded areas; below 1000 m. Anhui, Fujian, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangsu, Shaanxi, Shandong, Shanxi, Sichuan, NE Yunnan, Zhejiang.