THE ORNAMENTAL PLANTS — TREES 323 
Red, soft, or swamp maple, A. rubrum.* 
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.t 
Attractive as a lawn specimen when grown as a bush; the autumn color 
is very bright; small tree or big shrub. 
Mountain maple, A. spicatum.* 
Very bright in autumn. 
Box-elder, Acer Negundo (Negundo aceroides or fraxinifolium) .*f 
Very hardy and rapid growing; much used in the West as a windbreak, 
but not strong in ornamental features. 
Horse chestnut, #sculus Hippocastanum.tt 
Useful for single specimens and roadsides; many forms. 
Buckeye, 4. octandra (4. flava).*t 
Ohio buckeye, 4. glabra.* 
Red buckeye, #. carnea (4. rubicunda). 
Ailanthus, Aclanthus 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, Betula alba. 
Cut-leaved weeping birch, B. alba var. laciniata pendula.t 
American white birch, B. populifolia.* 
Paper, or canoe birch, B. papyrifera.* 
