338 



WEED FLORA OF IOWA 



Ox-eye (Heliopsis scabra Dunal.). 



Description. — A rough, pubescent, perennial with opposite, 

 petiolecl, triple-nerved leaves; heads large, peduncled; scales of 

 involucre in 2-3 rows, nearly equal ; ray flowers yellow, 10 or 

 more, fertile; achenes smooth, thick, 4-angled, truncate; pappus 

 chaffy or 2-3-toothed. 



Distribution. — From New York west to Wisconsin, Minnesota 

 and British Columbia and southwest to Missouri, Kansas and 

 Arkansas. 



Extermination. — Though this weed is perennial, it is rather 

 easily destroyed by cultivation. 



Fig 196. Ox-eye {Heliopsis scabra). a, plant hair or trichome. Common In 

 orchards, waste places. Rather large yellow heads, and rough, opposite 

 leaves. 



(Photograph by Colburn. a, drawing by Charlotte M. King.) 



