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PREFACE. 



As that portion of the U. S. teritory laying Avest of Wyoming and 

 north of California is without a local Flora, a mere list of the species 

 known to grow within its borders will be something towards the makeing 

 of one, and be of some use until such time as something better can be 

 compiled. With this view thefollowing Catlacgue is isned. 



In makeing up the following litt it has been die aim to put in only 

 those species that I know to have be/n reported as growing in the region 

 West of Wyoming between the Northern line of California ard British Co- 

 lumbia: but it is probable that most of the plants of British Columbia, and 

 many Alaskan species will be found to grow in Northern Washington; and 

 many California and Nevada species will yet be found to grow within our 

 Southern border. 



In 1881 I published, (as an advertisement), a list of all the species 

 that I knew had been reported from the teritory embraced in the present 

 Catalague. At that time I could only find 1844 species and varieteis. The 

 present Catalogue contains 2152 species, and 227 varieties, 2379 in all; an 

 increas of 585 species and varieties, or about 30 per cent in six years. 



No dot:bt the next six years will show a grater rate of increas, for 

 the Botany of this region is but imperfectly known. 



THOMAS HOWELL. 



Arthur, Oregon: 

 February I5th, 1887. 



4G7G73 



