Bibliographical Notices. 51 



Torrey and 



and other lesser genera in similar proportion. The work it is in- 

 tended shall be completed in three closely printed 8vo volumes, 

 each of about 550 pages ; but as considerable time will necessarily 

 be occupied in the publication of the work, it is intended, for the 

 greater convenience of botanists, to issue the volumes in separate 

 parts as soon as printed. The first volume, therefore, which will 

 comprise the Exogenous Polypetalous plants, will appear in three 

 parts of about 184 pages each ; of which the first part is just 

 published ; the second is now nearly completed, a considerable 

 portion of the printed sheets having been forwarded to us ; and 

 the third will follow as soon as is convenient with its faithful exe- 

 cution. 



We also gladly take this opportunity to announce the arrival of 

 the second part of this invaluable work in this country, brought, 

 indeed, by one of the authors himself, Dr. Gray, who is come to 

 visit the collections of American plants in England and upon 

 the Continent, so as to clear up many dubious points in the spe- 

 cies and synonyms ; a labour in which we know he has been emi- 

 nently successful, and which will stamp a great additional value on 

 the work in question. The second part, although comprising the 

 proper complement of pages, does not bring us to the conclusion of 

 the LeguminoscE, a family of plants in which N. America is eminently- 

 rich, particularly in Astragalece. Astragalus alone includes 40 spe- 

 cies ; Oxytropis, 16; Phaca, 31 : and Homolobius. a new genus of 

 Nuttall with the aspect of Phaca and the legumes almost of Vicia, 

 10 species. Of Psoralea there are 27 species ; of Petalostemum, 13 ; 

 of Trifolium, 33, of which 12 belong to that beautiful group with 

 involucrated capitula. It gives us pleasure to find Mr. Douglas' 

 Texas plants included in this work. 



We flatter ourselves that the ' Flora of North America ' will 

 meet with all the encouragement its high merit entitles it to. 



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