TRbooora 
JOURNAL OF 
THE NEW ENGLAND BOTANICAL CLUB 
Vol. 22. October, 1920. No. 262. 
SCIENTIFIC NAMES APPLICABLE TO OUR PURPLE- 
FLOWERED EUPATORIUMS 
KENNETH K. MACKENZIE 
IN a very interesting article in a recent number of RHODORA 
(22: 57) Prof. K. M. Wiegand deals at length with * Eupatorium 
purpureum and its Allies." His conclusion that there are four dis- 
tinct and well-marked species in this group will, I believe, find ready 
acceptance among those who have devoted field study to it. In 
the vicinity of New York we are well acquainted with three of the 
species, carefully described in the various editions of Wood's Botany; 
and from herbarium material had judged there was an additional 
species of northern range not known in our immediate neighbor- 
hood. 
But when it comes to applying names occurring in botanical litera- 
ture to the various species recognized, one does not find himself at 
all in agreement with the application of names made by Prof. Wie- 
gand. As the plants dealt with are very conspicuous and abundant 
members of our flora, it seems worth while to go into the questions 
involved at some length and to consider in detail the evidence avail- 
able as to the identity of some of the species proposed by the earlier 
botanists. 
In order to lead to a clear discussion of the problems involved let 
us give the four species numbers in the same way as done by Prof. 
Wiegand and give to each its distinguishing characters taken from 
his paper. 
