INTRODUCTION 1 7 



Two more Flora now appear, the Prodromus 

 Florae Columbianae of Dr. J. A. Brereton, 1830, 

 and, shortly after, Dr. C. W. Short's paper, 

 Florula Lexingtoniensis, these heralding a bigger 

 piece of work by Beck on Botany of the Northern 

 and Middle States, 1833. The Rev. L. D. von 

 Schweinitz followed with an elaborate paper on 

 Synopsis of North American Fungi, 1834, and 

 the year was also notable by the fact that Dr. Asa 

 Gray issued his first paper, A Monograph of 

 North American Rhynchosporae. Dr. John L. 

 Riddell published his Synopsis of the Flora of the 

 Western States in 1835, Gray appearing again, 

 this time with Dr. John Torrey, to rejoice the 

 student with their Elements of Botany, 1836, fol- 

 lowed in 1838 by a work which became a standi 

 ard authority, the Flora of North America. In 

 between these two books came Gray's Revision 

 of the North American Melanthaceae, Darling- 

 ton's Flora Cestrica and Dr. W. E. A. Aikin's 

 Catalogue of Phaenogamous Plants and Ferns 

 Growing in the Vicinity of Baltimore. 



Dr. George Engelmann is the next botanist on 

 the list, with his Monograph of the North Ameri- 

 can Cuscutineae, 1 842, Torrey pressing on behind 

 in 1843 with " two ponderous quarto volumes, 

 embellished with 161 colored plates " on the 

 Flora of the State of New York. Dr. Alvan W. 

 Chapman made a useful List of Plants growing 



