Bui. 1167, U. S. Dept. "of Agriculture. 
Plate IV. 
Fig. I. — Tubers of the White Guinea, or Negro, Yam (Dioscorea rotun- 
DATA POIR.). 
This is one of the best yams for home use and market grown in Porto Rico. The tubers shown 
above, received from Porto Rico, range from 2\ to 4 pounds each in weight. (P23774FS.) 
Fig. 2. — A lOVi-PouND Tuber of the Greater Yam 'Dioscorea alata L.), 
S. P. I. No. 47001, Grown in Central Florida. 
(P26827FS.) 
