LEAVES, BUDS AND FLOWERS 



95 



productive. The hop plant, persimmon and date palm 

 are of this class. 



The flowers of many of our most productive varieties 

 of strawberry yield lit- 

 tle or no pollen and 

 are unproductive, unless 



( \\vw- 111./ ^ LX 



(I 



FIG. 56. 



FIG. 57. 



growing near pollen- 

 bearing sorts (Figs. 56, 

 57) . In many varieties 

 of American plums and 

 in certain varieties of 



the pear and apple, the 

 pollen, even though pro- 

 duced freely, is infertile 



on stigmas of the same 



variety. To insure fe- 



cundation, it is wise to mingle varieties in fruit plan- 



tations rather than to plant large blocks of a single 



variety. 



FIG. 56. Imperfect flower of the straw- 



FIG 67 _ p erfec b ^ y wer of same . The 



numerous pistils appear in a circular 



