212 
IOWA ACADEMY OF SCIENCES. 
Scirpus L. 
111. S. lacustris L. (S. validus Yahl.) Great Bulrush. 
Very common in marshes, shallow lakes and 
along streams. 
112. S. fluviatilis (Torr.) A. Gray. Frequent in 
marshes; our largest fruited species. 
113. S. atrovirens Muhl. Low prairies, common. 
Eriophorum L. Cotton-grass. 
114. E. polystachyon L. Marshes and low prairies. 
115. E. gracile Koch. Rare in marshes. Our plant is 
the form called var . paucinervium by Engelman. 
Carex L. Sedge. 
116. C. lupulina Muhl. Low ground, Iowa Lake; rare. 
117. C. monile Tuck. Rare in low ground, Armstrong. 
118. C. retrorsa Schwein. Rare in woods; Estherville 
and Iowa Lake. 
119. C. hystricina L. Infrequent; Estherville and Spirit 
Lake. 
120. C. comosa Boott. Marshes; Armstrong. 
121. C. trichocarpa Muhl. Ravines west of Estherville. 
122. C. aristata R. Br. Rare; marsh one mile east of 
Armstrong. 
123. C. riparia W. Curtis. Frequent in marshes. 
124. C. lanuginosa Michx. (C. filiformis yar. latifolia 
Boeckl.) Frequent in low ground. 
125. C. filiformis L. Common in bogs; one of the 
principal plants which help to form the tough, 
floating sod in the quaking marshes. 
126. C. fusca All. (C. buxbaumii Ten.) Rare; in 
swamps near Armstrong. 
127. C. stricta angustata (Boott.) Bailey. Infrequent; 
shores of streams and lakes and occasionally in 
marshes; variable. 
128. C. limosa L. Rare; in marshes in Armstrong 
Grove township. 
129. C. longirostris Torr. Common in woods. A very 
distinct species. 
