丝蒟蒻薯 si xu ju ruo shu

Ataccia integrifolia (Ker Gawler) Presl; Tacca cristata Jack; T. laevis Roxburgh.

Rhizomes subcylindric, thick. Leaf blade oblong-lanceolate to oblong-elliptic, 50--55 × 18.5--21 cm, base cuneate, apex acuminate, sometimes caudate. Scape ca. 55 cm; involucral bracts 4, outer 2 sessile, narrowly deltoid-ovate, inner 2 long petiolate, spatulate, thin. Perianth purplish black; tube 1--2 cm; lobes 6, in 2 whorls, outer ones narrowly oblong, inner ones broadly obovate. Filaments spatulate at apex. Style extremely short; stigma deeply 3-lobed. Berry narrowly ellipsoid, 4--5 × ca. 2 cm, fleshy, 6-ridged, with persistent perianth lobes. Seeds irregulaly ellipsoid-ovoid. Fl. Jul--Aug.

Forests, mountain slopes; 800--900 m. SE Xizang (Mêdog Xian) [Bangladesh, Bhutan, Cambodia, E India, Indonesia, Laos, W Malaysia, Myanmar, Pakistan, Sri Lanka, Thailand, Vietnam].