DRUPACE^ 



401 



Prunus nigra. — This is the most northern of American plums. It is well 

 adapted to the States along the Canadian border. 



Prunus munsoniana. — This is the plum most grown in the South. The 

 varieties are mostly cling stones. Of all plums, these are most in need of 

 cross-pollination. A few of the chief varieties are Robinson, Newman, Wild 

 Goose, Arkansas, and Downing. 



Pninus angustifolia. — The Chickasaw plum is a small tree, 6 to 10 feet 

 high, sometimes shrubby. The fruit is small, almost globular, flesh yellow, 

 and of good quality. It ranges from Delaware to Louisiana and westward 

 to Arkansas and Texas. Its varieties do well in the Southern States. 



The two subspecies, watsoni and varians, have varieties of some horti- 

 cultural value, such as Purple Panhandle, African, Clark, Emerson, etc. 



CHERRIES 



corolla 

 I .ca\\j. 





Description.^ — The cher- 

 ries resemble plums in 

 many respects. The bark 

 of the cherry separates in 

 rings. The flower buds are 

 usually found on short 

 spurs (Fig. 166). In some 

 sour cherries, however, 

 axillary flower buds occur 

 on long, strong shoots. 

 These buds produce fruit 

 the following spring. Since 

 the lateral buds in such 

 shoots are flower-bearing, 

 no lateral branches are pro- 

 duced, and the result is a 

 long, naked branch. On the 

 spurs, the flower buds are 

 axillary and a branch bud 

 terminates the short shoot. 



The flower buds bear only flowers and no leaves (except very 

 rudimentary ones which persist but for a short time). There 

 26 



)^rowih 



Fig. 166.- 



-Spur of sour cherry (Prunus 

 cerasus) . 



