Photo by Mrs. W. E. Hooper. 



Dioscorea alata — The Greater Yam, a tuber of large size. 



Dioscorea esculenta — the Lesser Yam. -Three Papuan races; 

 424. "Memu," 428. "Tailukava." & 432. "Diba." 



Dioscorea Kegeliana — "Yam poule" of the West Indies. 



