256 Trees for Shade and Ornament 



F. quadra)igidata Michx. (108), Blue Ash, is adaplive to drier situa- 

 tions than the other species. 



Of European species there are two quite distinctive ones, both more 

 ornamental in their greenery than the American (but not quite hardy 

 at Ottawa): 



F. excelsior Linn. (109), the so-called English Ash, a native of 

 Europe, with various varieties, is quite attractive, with its finer, small, 

 serrate foliage and black buds. It is liable to a black knot fungus 

 disease. 



F. Ormis Linn, (no), Flowering Ash, a small tree from the Mediter- 

 ranean countries, with round head, more compact than most ashes, 

 with its numerous, white, feathery flowers (May, June), makes an attrac- 

 tive tree for small places and in front of groups. 



Gymnocladus. G. Canadensis Lam. (in), Kentucky Coffee Tree, is a 

 large tree of southern distribution, but hardy as far as Ottawa. With 

 large, very luxuriant, and striking, tropical-looking foliage, similar to 

 the Ailanthus, finely-fissured bark, but ragged, stout, somewhat crooked 

 and straggling branch system, it is picturesque and interesting rather 

 than beautiful, with heavy seed buds and apparently budless, bare 

 branches. It is well adapted for suburban street tree-planting, but 

 requires deep, rich soil. It is specially free from pests. 



HICKORIES 



Hicoria {Carya). There are nine species of large and small trees, 

 all confined to eastern United States. Most of them are of great eco- 

 nomical value and some (pecan and shellbark) more prized for their 

 fruit than for ornamental and shade purposes; yet the lofty, symmet- 

 rical, closely-knit, rather elegant, aspiring form of the large species, 

 the rather pale, medium to small sized compound leaves, turning golden 

 yellow, the picturesque, somewhat gnarled, pendulous branch system, 

 render them worth w'hile for planters on large grounds, singly in pas- 

 tures, or in groves with other trees. Having a very deep root system 

 they need deep and preferably rich soil. They are free from insects, 

 but suffer, although rarely, from the leaf spot fungus. They are best 

 used in single individuals, near houses, in fields, and to accentua-te an 

 elevation. 



The best species for ornamental usl- is perhaps: — 



