CONVOLVULACEiE 



557 



sorts ("yams") are Triumph, Nancy Hall, Dooley Yam, 

 Vineless Yam, Sugar, Southern Queen, Florida. 



Fig. 229. — Types of sweet potatoes (Ipomoea batatas). A, Black Spanish; 

 B. Shanghai; C, Big Stem Jersey; D, Red Bermuda; E, Southern Queen. 

 {Modified after Corbelt.) 



Fig. 230. — Types of sweet potatoes based upon the character of the foliage. 

 A, entire or round; B, shouldered; C, deeply cut or lobed. {After Price, Texas 

 Agr. Exp. Sta.) 



Leaf Shape as Basis of Classification.— Price has classified the varieties of 

 sweet potatoes according to leaf shape. These groups are as follows: 



1. Leaves round or entire (Fig 230, A) (Pumpkin, Shanghai, Southern 

 Queen, Big Stem Jersey). 



2. Leaves "shouldered," that is shallowly and broadly notched on either 



