558 BOTANY OF CROP PLANTS 



side near the apex (Fig. 230, B) (Delaware, Early Golden, Yellow Jersey, 

 Red Bermuda). 



3. Leaves lobed (Fig. 230, C) (Barbadoes, Sugar, Yellow Yam, Vineless 

 Yam). 



Sweet potato varieties may have skin color that is white, straw, red, or 

 purple. 



i. Skin white (Vineless Yam, Early Golden, General Grant). 



2. Skin straw (Orange, Delaware, New Jersey). 



3. Skin red (Pumpkin, Red Bermuda). 



4. Skin purple (Black Spanish, Brazilian). 



Uses. — Sweet potatoes are used chiefly as a human food. 

 Some of the coarser varieties are grown for hog pasture. The 

 vines have some value as a stock food. Flour, starch, glu- 

 cose, and alcohol are minor products of the root. Small- 

 sized sweet potatoes, known as "seconds," are canned. 

 Kiln-dried sweet potatoes produce a product very similar to 

 corn meal in its chemical composition. 



References 



Groth, B. H. a.: The sweet potato. Contrib. Bot. Lab. Univ. of Pa., 4: 

 i-io4, 1911. 



