DESCRIPTIVE MANUAL 



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Figure 179A Figure 179B 



Fig. 179-A. Distribution of White Snakeroot. 



Fig. 179-B. Boneset (Eupatorium rotundifolium) . 

 (Drawing by Lois Pammel.) 



Goldenrod (Solidago canadensis L.). 



Description. — A rough, hairy, pubescent perennial 3-6 ft. high; 

 lanceolate, pointed, sharply serrate leaves, especially pale in color, 

 pubescent beneath and rough above; heads in recurved racemes 

 forming panicles ; ray flowers yellow ; trichomes several-celled ; cells 

 short, walls pitted. 



Distribution. — Most widely distributed of the goldenrods from 

 the Atlantic to the Rocky mountains ; common in every part of 

 Iowa, especially in Story, Boone, Clinton, Linn, Allamakee, Potta- 

 wattamie, Woodbury, Cerro Gordo and Marshall counties. 



Extermination.- — This weed is quite largely spread by "seeds," 

 but is not difficult to kill by cultivation, although it sometimes 

 persists in fields for some years. Prevent the carrying of "seeds" 

 and give thorough cultivation. 



