322 Choice of Plant Material • 



with oblong or roundish outline, of vigorous growth, with luxuriant, 

 large, glossy foliage, adaptive to poorer soils, and free from insect 

 troubles. Of the many nursery forms, the weeping variety, pendula 

 (345a), Camperdown Elm, with a spreading habit, is one of the best to 

 make arbors. 



U. parvifolia Jacq. (346), a small tree to shrub, from China, hardy 

 to Massachusetts; with very attractive foliage, with small leaves, lus- 

 trous above, hairy below, and somewhat leathery; with a very long leaf 

 period; is one of the most attractive trees. 



A LIST OF SHRUBS 



Originally it had not been the intention of the author to 

 extend the scope of this book beyond discussing the methods 

 of taking care of trees after they are secured. 



It was the publisher who caused the addition of the preced- 

 ing chapter and tree list, and, although the author pleaded 

 comparative ignorance, he was still further inveigled into 

 compiling the following brief enumeration of ornamental 

 shrubs, with notes on their special uses and requirements. 



This list of over 200 shrubs covers the majority of species 

 in cultivation, and reference to the best known hybrids. 



As we have seen, the distinction between trees and shrubs 

 is not always hard and fast. While the single stem and 

 branching crown are characteristic of a tree, a number of 

 stems from a common root-stock are characteristic of a 

 shrub. Some tree species may, however, be trained to as- 

 sume the shrub habit, or this may take place naturally under 

 certain climatic or soil conditions, and vice versa: For the 

 landscape gardener, the general effect of the whole, rather 

 than the species habit, is determinative. Hence in nursery- 

 men's catalogues, the low tree species which are apt to grow 

 in bush-like form are classed as shrubs. 



As regards adaptation to climate, situation, and soil, shrubs 

 as a rule prove hardier than trees on account of their low 



