6 



PLANT^ WEIGHTIAN.E. 



r 



r 



herbarium ; another Lecomes the property of the Smithsonian Institution, which has 



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efficiently patronized this exploration. It will there fonn, with similar sets of the 

 collections of Fendler and Lindheimer, made in New Mexico and Texas, the 

 nuclcus of an important and authentic North American herbarium, destined to be 

 enriched, I trust, by continued accessions, especially from our newly-acquired ter- 

 ritories, until it shall comprise representatives of our whole ilora, and specimens 



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of all the vegetable products of our wide country. 



Another set of these plants will be found in the herbarium of John A. Lowell, 

 Esq., of Boston, who has liberally patronized Mr. Wrighfs scientific explorations. 

 The others, eight or nine in number, are about to be issued to the subscribers who 

 have apphed for them. 



The numbers prefixed to the names are those under which the specimens are 

 distributed. Those marked with a -f, in place of a number, were collected in single 

 specimens, or at least not in sufficient quantity for distribution. 



The whole will give a good idea of the vegetation, and consequently of the 



I append, 



from time to time, notices or characters of plants gathered by other collectors in 

 adjacent regions, especially by Dr. Wislizenus in the valley of the Rio Grande and 

 in Chihuahua, and by the indefatigable Dr. Gregg * in the same district and in the 

 northern provinces of Mexico, — chiefly from materials obligingly furnished by Dr. 

 Engelmann. 



Orclers or genera elaborated by Dr. Engelmann, Dr. Torrey, Mr. Bentbam, or 

 others, have the name of the author prefixed. 



A proper account of the topography and physical character of the region 



climate, general character, and capabilities, of the region traversed. 



traversed by the United States troops in their march from Texas to New Mexico 

 will doubtless be officially published, before the printing of this memoir is com- 

 pleted. It is therefore unnecessary for me to attempt to compile any such account 

 from Mr. Wrighfs disjoined and necessarily imperfect memorancla. 



A. GRAY. 



Harvard University, Cambridge, May, 1850. 



Tidings of the lamented death of this most assiduous collector, in Californla, have just been recelved 



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