[From the BuLtetin oF THE TorRREY Potanicar Cus 46: 235-252. 21 Jy 1919.] 
Taxonomic studies in Vernonia and related genera 
HENRY ALLAN GLEASON 
In preparing the manuscript for the tribe Vernonieae, to be 
published in the North American Flora, several new species and 
varieties were recognized and a few nomenclatorial changes 
became necessary. One of the latter, involves the erection of a 
new genus. Since the form of the North American Flora demands 
relatively concise descriptions and permits no critical discussion, 
the present paper is issued in advance. 
A variety, in the opinion of the writer, represents a group which 
is not worthy of specific rank, yet demands recognition in the 
intensive study of a species. In general, varieties are not ad- 
mitted into the North American Flora. Specific descriptions are 
drawn broadly enough to include all the varieties, while the 
varietal names are cited among the synonyms. The same treat- 
ment will be used for the varieties published here. 
Although this paper and the manuscript for the North Amer- 
ican Flora have been prepared at the New York Botanical Garden 
and are based primarily on the collections there, the writer has 
been gr eatly assisted by material from many American herbaria 
and takes this opportunity of expressing his thanks: to Mr. C. C. 
Deam and Mr. J. Lunell for material from their private herbaria; 
to those in authority at the University of California, the Field 
Columbian Museum, the University of Illinois, the Iowa Agri- 
cultural College, the University of Kentucky, the University of 
