228 



WEED FLORA OF IOWA 



Fig. 131- A. Distribution of Wild Carrot. 



ers in compound umbels, white, or occasionally pink; fruit oblong, 

 flattened dorsally, carpel with 5 slender bristly primary ribs, and 

 4 winged secondary ones, each of these bearing a single row of 

 barbed prickles. 



Distribution. — Common in eastern North America, especially in 

 dry fields. Becoming common in Iowa clover fields in Scott, Story, 

 Polk, Franklin, Linn, Clinton, Cerro Gordo, Boone, Webster, Sac 

 and Clay counties. 



Extermination. — Plant clean seed in a clean field. Easily killed 

 by cutting off the plant a few inches below the surface of the 

 ground. 



Parsnip (Pastinaca sativa L.). 



Description. — A tall, stout, glabrous biennial with grooved stem ; 

 leaves pinnately compound, cut-toothed; flowers yellow, small; 

 calyx teeth obsolete; fruit oval, flattened dorsally, the lateral ribs 

 with broad wings. 



Distribution. — Common in eastern North America, Rocky moun- 

 tains and the Pacific coast. Common on roadsides in every part of 

 Iowa. 



Extermination. — -Propagated by seeds. Easily exterminated by 

 cultivation ; cut off the young plants a few inches below the surface 

 of the ground. 



