322 MANUAL OF GARDENING 



Among drooping or weeping trees the best may be found in 

 the willows {Salix Bahylonica and others), maples (Wier's), 

 birch, mulberry, beech, ash, elm, cherry, poplar, mountain ash. 



Purple-leaved varieties occur in the beech, maple, elm, oak, 

 birch, and others. 



Yellow-leaved and tricolors occur in the maple, oak, poplar, 

 elm, beech, and other species. 



Cut-leaved forms are found in birch, beech, maple, alder, oak, 

 basswood, and others. 



List of hardy deciduous trees for the North. 



(The genera are arranged alphabetically. Natives are marked 

 by*; good species for shade trees by t ; those recommended by 

 the Experiment Station at Ottawa, Ontario, by {.) 



In a number of the genera, the plants may be shrubby rather 

 than arboreus in some regions (see the Shrub list), as in acer 

 (A. Ginnala, A. spicatum), sesculus, betula (B. pumila), car- 

 pinus, castanea (C. pumila), catalpa (C. ovata), cercis, magnolia 

 {M. glauca particularly), ostrya, prunus, pyrus, salix, sorbus. 



Norway maple, Acer platanoides.-\X 



One of the finest medium-sized trees for single lawn specimens; there are 

 several horticultural varieties. Var. SchwedleriX is one of the best of purple- 

 leaved trees. The Norway maple droops too much and is too low-headed for 

 roadside planting. 



Black sugar maple, A. nigrum.^-f 



Darker and softer in aspect than the ordinary sugar maple. 



Sugar maple, A. saccharum.^-\l 



This and the last are among the very best roadside trees. 



Silver maple, A. saccharinum (A. dasycarpum) *'f 



Desirable for water-courses and for grouping; succeeds on both wet and 

 dry lands. 



Wier's cut-leaved silver maple, A. saccharinum var. Wieri.'W 

 Light and graceful; especially desirable for pleasure grounds. 



