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, Fl-anklin, Linn, Clinton, Cerro Gordo, Boone, Webster, Sac 

 and Clay counties. 



Extermination.' — Plant clean seed in a clean field. Easily kiUed 

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

 ground. 



Parsnip {Pastinaca sativa li.) . 



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 planets a few inches below the surface 

 of the ground. 



