PLATE II. 



Dioscorea alata. Races Nos. 140 and 76, 



I 



IH2 



Dioscorea alata. Races Nos. 132 and 44. 



JA 



Dioscorea alata. 7 he flattened tubers of Nos. 14 and 74, and the snake - like 



tubers of No. 370. 



