The Strand and Dune Flora of die Pacific Coast 

 of North America : A Geographic Study 



By William S. Cooper 



PREFACE 



FIFTEEN YEARS AGO I undcftook a comprchensive investiga- 

 tion of the sand dunes o£ the Pacific coast of North Amer- 

 ica, in which physiography and vegetation were to have 

 an equal share of attention. The field work has been brought to 

 practical completion, and this paper embodies the first published 

 results of the study. 



The body of data which forms the basis of the present essay 

 rests primarily on my own observations — on lists and collections 

 made in the course of repeated visits to southeastern Alaska and 

 to all important dune areas from Puget Sound to northern Baja 

 California. In addition, I have personally examined the speci- 

 mens of the plants concerned deposited in the following her- 

 baria : 



University of Washington University of Minnesota 



University of California Field Museum of Natural History 



California Academy of Sciences United States National 

 Leland Stanford Jr. University Herbarium 



Pomona College New York Botanical Garden 



Missouri Botanical Garden Gray Herbarium 



I wish to express my appreciation of the courtesies extended to 

 me by those in charge of these herbaria, and particularly for 

 additional data suppUed by letter. The literature has also been 

 explored as thoroughly as possible. The ranges plotted on the 

 maps are based upon all these sources. Records founded on 



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