292 SYSTEMATIC POMOLOGY. 



Prunus cerasifera, seventeen of Primus triflora, seven of Prunus 

 pumila, and over sixty of Prunus domestica, and this includes a number 

 of varieties developed by Burbank and others by crossing with native 

 varieties, and it also includes the leading varieties of plums and prunes 

 grown in California and Oregon. 



Prof. F. A. Waugh, in his valuable book on " Plums and Plum 

 Culture," divides the native varieties into several groups or sub-species. 

 Prunus chicasa of Asa Gray is separated into the Miner-like group, 

 the Wayland-like group, the Wildgoose group, and the Chicasaw 

 group, and the northern species, Prunus Americana, is divided into two 

 groups the Americana and Nigra. 



This minute division cannot be made accurate, and is confusing to 

 amateur growers and those not familiar with botanical descriptions. 



At this time it will be best for the purposes of this publication to 

 follow the classification given by Prof. Bailey as follows : (1) Prunus 

 domestica, which includes the garden plums and prunes of European 

 origin and their hybrids; (2) Prunus triflora, which includes the newly 

 introduced varieties from Japan, their seedlings and hybrids; (3) 

 Prunus Americana, including the native varieties of the North; (4) 

 Prunus angustifolia, including the Southern types of chicasa; (5) 

 Prunus hortulana, including the Wildgoose group and the Miner-like 

 varieties, extending farthest north ; (6) the hybrid varieties and those 

 not easy to classify. 



As far as possible varieties no longer cultivated are omitted, and 

 where possible the relative hardiness of varieties will be indicated. 



For facts pertaining to propagation, cultivation, pruning, and 

 management, see index of Part I. 



The figures outlining the general forms of plums are copied from 

 Downing, and will prove some aid to beginners in understanding the 

 descriptions. 



FORMS OF PLUMS. 



Roundish. 



