MICHIGAN WEEDS. 



417 



Fig. 209 (183). 



Great Burdock. Arctium Lappa L. A large, fine-wooly, coarse, biennial, 1-2 m. 

 high; leaves large mostly heart shaped; heads clustered, 3-5 cm. broad, the outside 

 scales hooked at the top making a formidable bur; flowers purple. 



So far as the writer has observed, there are no plants of this species in the state, the 

 following species having heretofore passed for this one. Introduced from Europe. 



