312 WEED FLORA OP IOWA 



"White Snakeroot {Ewpaioriwm urticaefolium Riech.). 



Description. — Perennial, with smooth, branching stem 15-40 in. 

 high; broad, ovate, coarsely and sharply toothed, pointed, long- 

 petioled leaves ; flowers in compound, eymose clusters, white. 



Distribution. — Pennsylvania, Virginia, westward; reported from 

 many places in Iowa. 



Extermination. — This perennial weed is easily killed by cultiva- 

 tion. It is common in woodlands. It is mentioned here because 

 of its supposed poisonous nature. 



Fig. 179. Bcneset or White Snakeroot (Bupatorium urticaefolium,). Wood- 

 land pastures. 

 (Photographed by Quade.) 



