170 



REFERENCES CITED 



1. Piper, C. V. Flora of the State of Washington. Contr. U. S. Nat. 



Herbarium XI. 637 pp. 1906. 



2. Piper, C. V. and Beattie, R. K. Flora of the Northwest Coast. 418 pp. 



1915. 



3. Piper, C. V. and Beattie, R. K. Flora of Southwestern Washington and 



adjacent Idaho. 296 pp. 1914. 



4. St. John, Harold. Flora of Southeastern Washington and adjacent Idaho. 



Pullman, Washington. 531 pp. 1937. 



5. Jones, G. N. Botanical Survey of the Olympic Peninsula, Washington. 



Univ. of Washington Publ. in Biology. 5:288 pp. 1936. 



6. Jones, G. N. The Flowering Plants and Ferns of Mount Rainier. Univ. of 



Washington Publ. in Biology. 7:192 pp. 1938. 



Cornell University, 

 Ithaca, N. Y. 



BOOK REVIEWS 

 A new edition of a standard manual* 



George T. Hastings 



When Rehder's Manual of Cultivated Trees and Shrubs 

 appeared in 1927 it became almost at once a standard work essen- 

 tial to everyone working with woody plants in the United States. 

 In the years since its publication new plants have been introduced, 

 new varieties and hybrids have been developed, some changes in 

 names have been necessitated by amendments to the International 

 Rules of Botanical Nomenclature, and critical study of species 

 has resulted in changes. All these are incorporated in the new edi- 

 tion, bringing the Manual up to date. Some 200 more species are 

 added, with a corresponding increase in the number of varieties 

 and hybrids. The map showing zones of hardiness, too small to be 

 used conveniently, has been redrawn and printed in two colors as a 

 full page plate. Seven instead of eight zones are recognized, but 

 the reduction is practically to six zones as I, the treeless area of 



* Manual of Cultivated Trees and Shrubs. Second Edition, Alfred Rehder. 

 XXX + 996 pages. The Macmillan Company. 1940. $10.50. 



