MICHIGAN WEEDS. 



415 



Fig. 205 (179). 



Ragweed. Hogweed. Ambrosia artemisii- 

 folia L. A hairy, much branched, very variable 

 annual, 30-180 cm. high; leaves thin, cut lobed; 

 racemes of the male flowers very numerous, 

 female heads clustered above the base of the 

 leaves. 



Fig. 206 (180). 



Great Ragweed. King Head. Ambrosia 

 trifida L. A rough or nearly smooth, branched 

 annual, 1-6 m. high; leaves deeply 3-5-lobed; 

 racemes of male heads 4-20 cm. long, female 

 heads clustered above the leaves. 



