364 



WEED FLORA OF IOWA 



Fig. 2 12- A. Distribution of Ox-eye Daisy. 



Chemical Composition. — Its chemical composition according to 

 Me. Bull. Agr. Ex. Sta. 26:6 (1888), is as follows.* 



FRESH OR AIR DRY MATERIAL. 



Tansy (Tanacetum vulgare L.). 



Description. — A bitter, acrid, strongly scented, poisonous herb 

 or branched perennial 2-4 ft. high; leaves pinnately divided into 

 linear-pinnatifid divisions, lobes serrate; heads many-flowered, few 

 ray flowers, disk yellow ; marginal flowers fertile ; scales of the invo- 

 lucre in several series ; receptacle flat or convex, naked ; branches 

 of the style brush-like at the summit ; achenes 5-angled or 5-ribbed, 

 truncate or obtuse ; pappus none or a short crown. 



Distribution. — Common throughout the southern states from the 

 Atlantic to the Pacific but more common in eastern North America. 

 Common in many parts of the state of Iowa, especially in some 

 communities, in gardens and along roadsides. 



Extermination. — Easily exterminated by cultivation. 



•Compiled by Jenkins and Wvnton ; Bull. Off. Exp. Sta. 11 :78. 



