THE ORyAMENTAL PLANTS — TREES 323 



Red, soft, or swamp maple, A. ruhrum.'^ 



Valuable for its spring and autumn colors, and for variety in grouping. 



Sycamore maple, A. Pseudo-platanus. 



A slow grower, to be used mostly as single specimens. Several horticul- 

 tural varieties. 



English maple, A . campestre. 



A good medium-sized tree of slow growth, not hardy on our northern 

 borders; see under Shrubs (p. 291). 



Japan maple, A. palmatum {A. polymorphum) . 



In many forms, useful for small lawn specimens; does not grow above 

 10-20 ft. 



Siberian maple, A. Ginnala.X 



Attractive as a lawn specimen when grown as a bush; the autumn color 

 is very bright ; small tree or big shrub. 



Mountain maple, A. spicatu?n.* 

 Very bright in autumn. 



Box-elder, Acer Negundo (Negundo aceroides or fraxinifolium) .*"[ 



Very hardy and rapid growing; much used in the West as a windbreak, 

 but not strong in ornamental features. 



Horse chestnut, Msculus Hippocastanum.-\X 



Useful for single specimens and roadsides; many forms. 



Buckeye, ^. octandra {M.flava).'^X 

 Ohio buckeye, ^. glabra."^ 

 Red buckeye, ^. carnea {M. ruhicunda). 

 Ailanthus, Ailanthus glandulosa. 



A rapid grower, with large pinnate leaves; the staminate plant possesses 



a disagreeable odor when it flowers; suckers badly; most useful as a shrub; 



see the same under Shrubs (also Fig. 50). 



Alder, Alnus glutinosa. 



The var. imperialist is one of the best cut-leaved small trees. 



European birch, Betida alba. 



Cut-leaved weeping birch, B. alba var. laciniata pendula.% 



American white birch, B. populifolia* 



Paper, or canoe birch, B. papyrifera.* 



