Leaves of Four Native American Species of Grapes Extensively Used as Stocks 

 on Which to Graft Vinifera Varieties. 



Fig. l.—Vitisrupestris, upper and lower side of leaf, one-fourth natural size. Fig. 2.— Vitis aestivalis, 

 upper and lower side of leaf, one-fourth natural size. Fig. 3.— Vitis labrusca, upper and lower side 

 of leaf, one-seventh natural size. Fig. 4.— Vitis riparia, upper and lower side of leaf, two-nttn s 

 natural size. 



