908 



COMPOSITAE 



Eupatorium 



50 



Map 1986 



Eupatcnum altissimum L 



Map 1988 

 Eupatorium perfoliatum L 



6. Eupatorium sessilifolium L. Upland Boneset. Map 1987. Infre- 

 quent in many parts of the state. It is generally found on high, wooded 

 ridges and in dry, sandy woods. It is usually common where it is found. 



Vt. and Mass. to 111., southw. to Ga., Ala., and Mo. 



7. Eupatorium perfoliatum L. Boneset. Map 1988. Frequent to com- 

 mon in all parts of the state in low ground in woodland, pastures, and fallow 

 fields and along ditches and roadsides. The tops and leaves were formerly 

 an official drug and the pioneers freely used a warm infusion of it as a 

 diaphoretic. 



The leaves and flowers are variable and these variations have been 

 named. I have included all forms in the one map. 



7a. Eupatorium perfoliatum f. truncatum (Muhl.) Fassett. This is a 

 form with at least the upper leaves separate, truncate or rounded at the 

 base. A few of my specimens belong to this form. 



7b. Eupatorium perfoliatum var. cuneatum Engelm. This is a form 

 with leaves smaller, narrowed at the base, and separate; heads fewer- 

 flowered. I found it along a moist, sandy roadside in Newton County about 

 2 miles north of Lake Village. 



7c. Eupatorium perfoliatum f. purpureum Britt. A form with pur- 

 plish flowers. It is not as common as the typical form which has white 

 flowers. 



N. S. and N. B. to Man., southw. to Fla. and Tex. 



8. Eupatorium rugosum Houtt. (Rhodora 40: 293. 1938.) (Eupa- 

 torium urticae folium Reich.) White Snakeroot. Map 1989. Frequent to 

 common in most of the dry and moist woods of the state. It is more com- 

 mon in beech and sugar maple and black and white oak woods. This plant 

 is poisonous to grazing animals and if it is eaten in a sufficient quantity it 

 proves fatal. A symptom of having eaten too much of this weed is a 

 trembling of the animal and because of this characteristic, the disease has 



