47^ TRANS. ST. LOUIS ACAD. SCIENCE. 



name being identical with, or too nearly resembling, that of the 

 genus. The same principle has been applied to varietal names. 

 Date of publication as indicated by the title-page or collateral 

 evidence, and lineal sequence in a given publication, have been 

 taken as the grounds for deciding priority. In the absence of some 

 works, recourse has been had to dated lists in Pritzel, Thesau- 

 rus ; DC. Syst ; Don, Mill. Diet. ; Torr. Fl. N. Y., etc. 



The question of identity and synonymy has been a difficult one. 

 For this I have depended upon the standard authorities, as I have 

 been able to refer to the specimens in but few cases. I have used 

 the earliest name concerning which there seems to be no reason- 

 able doubt, while those which were less certain have not been 

 taken up. Consequently there are names which may give way 

 to earlier ones when investigated by those more competent for 

 the task; but the bibliography of each name has been worked 

 out as thoroughly as my resources would permit. In this work 

 I have been very materially aided by Dr. Watson, Dr. Britton, 

 Prof. Scribner, and Mr. D. G. Fairchild. 



Following each name is the place and date of publication, so 

 far as this could be ascertained. To avoid repetition, a dated list 

 of the principal works quoted has been appended to the cata- 

 logue. Where a species was originally placed under a different 

 genus from the one accepted, the author of the specific name is 

 quoted in parenthesis, followed by the author of the accepted 

 combination. A name has been considered published when, in 

 connection with the generic and specific name, there is sufficient 

 description to identify the species. The date of publication has 

 been taken to be that of issue. For example, a description of 

 Cypripedium speetabile, Salisbury, was read before the Lin- 

 mean Society in 1788, but was not published until 1791, subse- 

 quent to C. rcgincc, Walt., and C. album, Ait. When an author 

 transfers a species from one genus to another, but does not make 

 the combination under the new genus, he is nevertheless quoted 

 for that combination if he singles out the species. For example, 

 Robert Brown in his Prodromus Flone Novae Hollandiae esta- 

 blishes the genus Eleocharis. In a note he says, "genus na- 



turale efTormat cui pertinent Scirpus palustris, L., et 



acicularis, L." I have quoted Brown as the author of E. pains- 



