NOTES AND REFERENCES. 7 



they be really distinct. Aiton's description of the former 

 h&s foliis obovati-lanceolatis; but the figure in Curtis's mag- 

 azine does not give the leaves, so formed. Michaux, who, 

 must have seen our plant, gives but one species, Virginicura, 

 to which he has referred (erroneously as to one) all of Wal- 

 ter (Prasium.) In our, immediate, vicinity I have not met 

 with any Diacocephalum, save in the Botanic gardens. The 

 two just mentioned, in all the play between both, abound in 

 the south-west part of Pennsylvania. Mulilenberg, I know, 

 referred our plant to Curtis's figure of denticulatum. The 

 leaves, of several species, are destitute ot serratures towards 

 their base. Vide, Pursh, Walter, and Michaux. 

 " The islands and margins of the Potomac, afford the Bo- 

 tanist fine scope, borne as the seeds are, by its waters from 

 beyond the mountains, and from the southern region of its 

 Shenandoah's head. " 



td 



Author Sy and Titles of their Works, 



O Z 



fccc 

 o a; 



"i 



bAfi 

 o <u 



1762 

 1788 

 1803 

 1814 



1814 

 1814 



1824 



1818 



1818 



i819to 



1821 



1826 

 1830 



Gronovius' Clayton, Flora Virginica. . 



Walter, Flora Caroliniana 



Michaux, Flora Boreali Americana. . . 



O. Rich, a Synopsis of the Genera of 

 American Plants 



Pursh, Flora Americse Septentrionalis . 



Bigelow, Flora Bostoniensis 



Do. do. 2d edition, 

 greatly enlarged 



Nuttall, The Genera of North Ameri- 

 rlcan plants and catalogue of the spe- 

 cies to the year 1817 



Barton, Flora Philadelphia • • • • 



Elliott, of S C. A sketch of the Botany 

 of South Carolina and Georgia 



Torrey, a Compendium of the Flora of 

 tlie northern and middle states north 

 of the Potomac 



Darlington, Florula Cestrica 



Prodromus Flora Columbianse 



428 

 435 

 608 



772 

 739 

 294 



455 



35 

 18 

 58 



101 

 27 

 10 



15 



834! 27 

 398 14 



616 



615 

 351 



438 



00 



393 

 417 

 550 



671 

 712 

 284 



440 



384 

 616 



592 

 351 



425 



1824 



Smith, The English Flora, (comprising 

 all tiie plants of Great Britain) 



480' 18 462 



