EUPATORIUM PERFOLIATUM. 
Thorough wort, 
‘PLATE I1. 
Tux peculiar form and arrangement of the 
leaves in this plant render it very easy of distine- 
tion at sight by the most inexperienced botanist. 
It flowers from midsummer to September, and is 
found in all latitudes from Nova Scotia to Florida. 
{t inhabits meadows and boggy soils, growing 
most frequently in bunches, the stems being con- 
nected by horizontal roots. Its common names 
are Thorough wort, Thorough waa, Cross wort, 
Bone set, &c. 
The genus Eupatorium, belonging to the first 
order of the class Syngenesia or Compound flow- 
ers, and to the order Corymbifere of Jussieu, is 
characterized by its naked receptacle, its down 
simple or rough, its calyx oblong and imbricate, . 
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