Alders and Shadbush 27 
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Fic. 95. ~~ Black Alder. Alnus glutinosa Gaertn. 
The native species, six in number, are mostly shrubs or shrub-like 
trees, useful for grouping on rocky sites and along watercourses, so 
far but little utilized; among them, A. rugosa K. Koch. (159) (ser- 
rulata); A, incana Willd. (160), with brown and white dotted branches; 
A. viridis D. C. (161), our commonest native shrubs; A. maritima 
Muhl. (162), with shining foliage and attractive by the development 
of male catkins in the fall. All of these lend themselves effectively 
for massing, alone or with willows, their foliage starting earlier and 
remaining longer. They are most adaptive, and easily transplanted. 
SHADBUSH OR JUNEBERRY 
Amelanchier. A.Canadensis Medic. (163), one of the representatives 
of a genus of the rose family, from North America and Japan, with a few 
