3SESCKIPTIVE MANUAL 



351 



Distribution. — ^Moist sitnations from New England to Missouri. 

 Common in southern Iowa. 



Extermination. — This annual is most abundant in low fields. It 

 succumbs readily to cultivation. The plants should not be allowed 

 to go to seed as the seed is scattered by animals; its spreading, 

 therefore, can be prevented by cutting the plant off close to the 

 surface of the groBsid when it begins to blossom. 



Beggar-ticks, Stick-tight, Boot- jack {Bidens frondosah.) . 



Description. — A branching, hairy or smooth annual 2-6 ft. high; 

 leaves petioled, 3-o-divided, terminal leaflet lonc;-stalked, pointed, 

 coarsely toothed, frequently divided again; rays small, yellow invo- 



Hg. 205. Boot-jack, Spanish Needle, (.Bidens frondosa). Common in gardens. 



The "seeds", more properly aehenes, are scattered by animals. 



(Photographed by Collmm.) 



