DESCRIPTIVE MANUAL 



65 



Slender Rush (J uncus tenuis Willd.). 



Description. — A leafy perennial, wiry stem, 9-18 in. high; leaves 

 flat or channeled ; flowers in panicles, the panicles shorter than the 

 involucral leaves ; flowers green, sepals lanceolate-acute, spreading 

 in fruit ; capsule green ; seeds small, ribbed. 



Distribution. — A cosmopolitan weed widely distributed in North 

 America; common along beaten paths and fields, especially in pas- 

 tures, in every part of Iowa. 



Figure 25 Figure 35A 



Fig. 35. Wire Grass or Slender Rush (Juncus tenuis). Common in pastures 



along roadsides. 



(Photographed by Colburn. ) 



Fig. 35-A. Distribution of Slender Rush. 



Extermination. — This weed is not difficult to exterminate by cul- 

 tivation. Where it occurs in pastures that cannot be cultivated, an 

 effort should, be made to start a leguminous plant like white clover 

 which will kill out the rush to some extent. 

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