788 



MANUAL OF POISONOUS PLANTS 



nately dissected ; heads solitary, many flowered ; ray flowers white, pistillate^ 

 fertile or neutral ; involucre of numerous small imbricated dry and scarious 

 scales ; disk flowers yellow, small, tubular ; achenes terete or ribbed, smooth, 

 truncate ; pappus none or a minute crown. 



Distribution. A common weed in Europe where it is a native. Widely- 

 scattered in the Northern States from the Atlantic to the Dakotas and Nebras- 

 ka. Occurs also in Washington and Oregon. In the north Mayweed is common 

 in yards and along roadsides. 



Poisonous properties. The strong odor and acrid taste makes it extremely 

 undesirable for stock. The Mayweed blisters the skin. 



Anthemis arvcnsis L. Corn Chamomile 

 A much branched annual or biennial pubescent herb, not ill-smelling; leaves 

 sessile, finely 1-2 pinnately parted, less divided than the preceding; heads numer- 

 ous; bracts of the involucre oblong, obtuse, usually somewhat pubescent with 



Fig. 452. Aitthemis nobilis. Cultivated as an orna- 

 mental plant. Faguet. 



broad scarious margins; ray flowers white, pistillate, mostly 2-toothed ; chaff 

 of the receptacle obtuse; achenes oblong, obtusely 4-angled; pappus a small 

 border. 



