Represented with us by the genus

Dioscore'a

Plunder. Yam. D. villo'sa, L. (Wild Yam-root.) A slender twiner, with knotted rootstocks, and net-veined, heart-shaped, 9-11-ribbed petioled leaves. Flowers dioecious, small, in axillary racemes. Stamens 6. Pod with three large wings. - Reported only from the warm and sheltered valley lying between Hamilton and Dundas, Ont., the banks of the Thames at London, Ont., and Niagara Falls.