THE CLASSIFICATION OF PLUMS 189 



the southern states. Best represented by such varie- 

 ties as Newman, Munson, and Robinson. 



XVI. SAND PLUMS (Prunus angustifolia watsoni). 

 Much like the foregoing, but dwarfer, never reaching 

 a height of more than eight feet, usually only four 

 to five feet; branches short jointed, zigzagged, and 

 thorny; leaves small, conduplicate, finely serrate; 

 fruit small, much like that of the Chickasavv group. 

 Native in Kansas. The variety Strawberry, found 

 only in large collections, is the best named repre- 

 sentative. 



XVII. MISCELLANEOUS PLUMS. Even these sixteen 

 diverse groups will not accommodate all the culti- 

 vated plums-. There are still a number of varieties 

 to be accounted for. These fall mostly into two 

 classes, though without any necessary resemblance of 

 individual varieties in each class. These are: 



1. HYBRID PLUMS. Such as are derived from the 

 combination of various species in the foregoing list, 

 and are yet not provided for in the three hybrid 

 groups named above. 



2. MISCELLANEOUS SPECIES are represented by one 

 or two varieties each, but are not of sufficient imme- 

 diate or presumptive economic value to justify their 

 special mention in a list of plums for orchard plant- 

 ing. The most important botanical groups thus re- 

 served are as follows: Primus subcordata, P. maritima, 

 P. gracilis, P alleghenensis. 



Arbitrary Classification 



Any one who looks over the foregoing 

 natural arrangement of plums, even super- 



