212 IOWA ACADEMY OF SCIENCES. 



SCIRPUS L. 



111. *S\ lacustris h. (S. valid us Ysbhl.) Great Bulrush. 



Very common in marshes, shallow lakes and 

 along streams. 



112. S. fiuviatilis (Torr.) A. Gray. Frequent in 



marshes; our largest fruited species. 



113. S. atrovirens Muhl. Low prairies, common. 



Eriophorum L. Cotton-grass. 



114. E. polijstachyon L. Marshes and low prairies. 



115. E. (jrac'de Koch. Rare in marshes. Our plant is 



the form called \ sly. pane inervium by Engelman. 



Carex L. Sedge. 



116. C. Uipulina Muhl. Low ground, Iowa Lake; rare. 



117. C. nioiile Tuck. Rare in low ground, Armstrong. 



118. C retrorsa Schwein. Rare in woods; Estherville 



and Iowa Lake. 

 111). C. Jiysfricina L. Infrequent; Estherville and Spirit 

 Lake. 



120. C. coiiiosa Boott. Marshes; Armstrong. 



121. C. fricliocarpa Muhl. Ravines west of Estherville. 



122. C. aristnia R. Br. Rare; marsh one mile east of 



Armstrong. 



123. C. ylparia W. Curtis. Frequent in marshes. 



124. C. lanuginosa Michx. (C. fiUformis var. Jatifolia 



Bffickl.) Frequent in low ground. 



125. C. fiUformis L. Common in bogs; one of the 



principal plants which help to form the tough, 

 floating sod in the quaking marshee. 



126. C. fusca All. (C. huxhaumii Ten.) Rare; in 



swamps near Armstrong. 



127. C. sfricfa ancjastata (Boott.) Bailey. Infrequent; 



shores of streams and lakes and occasionally in 

 marshes; variable. 



128. C. liniosa L. Rare; in marshes in Armstrong 



Grove township. 



129. C. longirostris Torr. Common in woods. A very 



distinct species. 



