H5 • 



accomplish no good result to enumerate here the imperfections 

 that have come to the notice of the reviewer. And omissions 

 seertis to be as scarce as errors. 



John Hicndley Barnhart. 



Winter Botany, William Trelease* 



This little book is a companion volume to the author's Plant 

 Materials of Decorative Gardening which gives keys for deter- 

 mining trees and shrubs in their summer condition. The present 

 volume gives keys based on twig, bud and leaf-scar characters 

 by means of which practically all of the trees and shrubs, native 

 or cultivated, can be determined in the winter. The key refers 

 to 328 genera and 1 100 species and varieties, considerably more 

 than are given in Plant Materials, though the evergreens de- 

 scribed in that volume are omitted in the present book. With 

 all genera containing more than one species keys are given to the 

 species or varieties. 



Necessarily the characters used to separate species are often 

 comparative and so difficult to use where only one form is being 

 traced out. For example it will be difficult to decide whether a 

 „twig is "distinctly glan,dular-warty " or "nearly smooth," or 

 again whether a twig is "moderately slender" or "very slender." 

 In such cases it may be impossible to decide which species one 

 has, but nine times out of ten there should be no trouble. With 

 each genus Is a series of drawings showing clearly the determining 

 characters, with the aid of these drawings the user may feel cer- 

 tain of his identification of the genus and often of the species. 

 The characters of the genera are described briefly, but no de- 

 scriptions of the species are given. This omission is neces- 

 sary in a book of pocket size that attempts to give so many 

 species. 



After each genus, or sometimes after the last genus of a family, 

 page references for each species are given to a number of texts. 

 In some cases these references occupy as much as two pages. 

 As the books referred to are listed in the back these references 

 to species might have been omitted with considerable saving of 

 space. For example, page references are given for every species of 



* William Trelease, Winter Botany. Second Edition, Revised, Published 

 by the author, Urbana, 111. Pages xlii + 396. 1925. 



