

PREFACE. 



The first volume of this work having been at length comple- 

 ted, the authors have to perform the pleasing duty of offering 

 their acknowledgments to their numerous friends and corres- 

 pondents who have rendered important assistance to their 

 arduous undertaking. 



To Sir William Hooker, than whom perhaps no person has 



^ done more for the advancement of North American Botany, we 



~ are largely indebted, not only for the opportunity of consulting 



'^^ his rich herbarium and excellent library under the most 



■a"i favorable circumstances, on two different occasions, but for the 



generous communication of a great number of authentic speci- 



^ mens of the plants described in the Flora Boreali- Americana, the 



Botany of Capt. Beechey^s Voyage, and other works, selected 



^ from the collections made in the Northern land expeditions of 



''' Capt. Sir John Franklin, those of the Arctic voyages of discovery, 



Lij and especially from those made in Oregon, the Rocky Mountains, 



&c. by the late Mr. Drummond, the late indefatigable Douglas, 



^ Mr. Tolmie, and others. To Dr. Richardson we are directly 



J indebted for many plants collected by himself in Capt. Frankhn's 



(A first expedition to the shores of the Arctic Sea ; and to Dr. now 



Professor Scouler, for a collection of Oregonplants. 



To INIr. Brown our acknowledgments are due for the unre- 



^ strained opportunity of consulting the Banksian herbarium, as 



QQ well as the herbaria of Clayton, Catesby, Plukenet, and the other 



V/ collections in his charge at the British Museum ; and to Mr. 



O Bennett, the Assistant Curator, and Secretary of the Linnsean 



