iv INTRODUCTION. 



systems of high mountains within its limits contain a very varied flora and 

 provide a wide field for further botanical explorations. Without doubt these 

 mountains contain many species of plants new to botanists, while many others 

 as yet are known from but single collections. The lack of a suitable handbook 

 has doubtless deterred many from studying the plants of the region. If this 

 book shall stimulate greater activity and interest in its flora, the authors will 

 feel amply repaid for their labors. 



The material upon which this flora is based is mainly that contained in 

 the herbarium of the State College of Washington. Thanks are due to the 

 officials of that institution for encouragement and support in the preparation 

 of this volume. 



