DESCRIPTIVE MANUAL 



309 



Ironweed {Veronia haldwmi Torr.). 



Description. — A roughish, pubescent, perennial 3-5 ft. tall; 

 leaves lance-oblong or ovate, denticulate; heads in open, cymose 

 clusters, about 25-fl.owered; involucre hairy-tomentose ; bracts 

 squarrose, purplish or greenish ; involucre acuminate. 



Distribution. — Common from Maine to Missouri and southward. 

 It is found in central Iowa, from Webster county southward and 

 along Missouri river to Council Bluffs. 



Extermination. — Frequently a troublesome weed. Usually not 

 difficult to exterminate in cultivated fields. 



Fig. 177, Ironweed (Vernonia T}aldwinl). Common in low pastures. 



in heads. 

 (Photographed by Colburn.') • 



Flowers 



