78 



SILVA OF NORTE AMERICA. moeace^. 



Mulberry-trees can be easily raised from seeds which germinate during the spring, and the varieties 

 can be increased by cuttings made from the mature wood or from the roots, by root and crown-grafting, 

 and by budding in early spring with dormant buds. 



Morus, the classical name of the Mulberry-tree, was adopted for this genus by Tournefort,^ and 

 afterward by Linnaeus. 



1 Inst. 589, t. 362. 



SYNOPSIS OF THE NORTH AMERICAN SPECIES. 



Leaves ovate, smooth or scabrate on the upper, coated with pale pubescence on the lower surface ; 



fruit oblong, dark purple 1. MoRUS rubra. 



Leaves ovate, smooth or scabrate on the upper, glabrous or pubescent on the lower surface ; fruit 



subglobose or short-ovate, nearly black 2. MoRUS celtidifolia, 



