180 WEED FLORA OF IOWA 



glandular toothed; flowers corymbose, calyx tube urn-shaped, 5 

 sepals, smooth or occasionally hispid, petals 5, rose-colored; fruit 

 oblong, ovaries hairy. 



Distribution. — Common in prairies and field from Texas to Min- 

 nesota, west to Colorado. Common everywhere in Iowa; Story, 

 Polk, Emmet, Dickinson, Palo Alto, Clay, Kossuth, Winnebago, 

 Allamakee, Clinton, Muscatine, Scott, Decatur, and Pottawattamie 

 counties. 



Extermination. — This weed often persists in grain fields of 

 northern Iowa. Thorough cultivation for a few seasons will, how- 

 ever, usually destroy the weed. 



Stickweed {Geum canadense Jacq.). 



Description. — ^A perennial herb from 114-2 ft. high; leaves pin- 

 narte, the lower of 3-5 leaflets or undivided ; stem leaves 3-divided or 

 3-lobed, sharply toothed ; stipules ovate-oblong ; flowers white ; calyx 

 bell-shaped ; deeply 5-clef t ; petals 5 ; stamens many ; pistils numer- 

 ous; styles jointed and bent near the middle, the upper part falling 

 away and the lower part hooked. 



Distribution. — Widely distributed in northern United States, and 

 frequently found in woods or fields adjacent thereto ; common espe- 

 cially in northeastern Iowa. 



Extermination. — This weed is easily scattered by animals because 

 of the hooked achenes ; thorough cultivation will, however, destroy 

 it. 



LEGUMINOSAE, PULSE FAMILY. 



This family contains the clover, pea, beans, eowpea, soybean, 

 honey locust, lupines, vetches, coffee bean, senna, and ornamental 

 plants as red bud, sweet pea, caragana, etc. 



