IOWA ACADEMY OP SCIENCES. 211 



Elymus L. Wild Kye. 



96. E. striatus Willd. Frequent in woods. 



97. E. virginicus L. Frequent in woods, and on river 



banks. 



98. E. canadensis h. Common, and extremely variable. 

 Hystrix Moench. 



99. //. hystrix (L.) Millsp. {Elijmus hystnx L.) Com- 



mon in woods. 



cyperace^. 

 Cyperus L. 



100. C. riruluris Kunth. (C. diundrus var castaneus 



Torr.) Very common and variable; banks of lakes 

 and rivers. 



101. C. infexusMxxhX. [C. aristatasB^ckX;) Common; 



banks of lakes and streams. 



102. a. sehweinifzii Torr. North shore of Swan Lake; 



also at Spirit Lake, Dickinson county. 



103. C. erythrorhizos Muhl. Banks of lakes and streams; 



our handsomest species. 



104. C. spvciosa Vahl. Banks of lakes and streams, and 



in marshes; very variable. 



105. C. strif/osus L. Less common than the preceding 



and in similar situations; variable. 

 .106. C. striyosus capitaius Breckl. Very distinct in ap- 

 pearance, but undoubtedly merely a state pro- 

 duced by very dry weather. Rare; slough one 

 mile northeast of Armstrong. 

 Eleocharis R. Brown. 



107. E. pain sir is [h) R. & S. Common injiiarshes and 



variable. 



108. E. palnstr is ylaucescensi"^ iWd.) Gray. Very com- 



mon in low ground. 



109. E. acicularis (L.) R. & S. Everywhere in low 



marshy places. 



1 10. E. woljii Gray. Rare ; low prairies near Armstrong. 



