IOWA ACADEMY OF SCIENCES 
31 
Hordeum. 
115. H. juljatum L. Abundant. A very troublesome weed. 
Elymus. 
116. E. striatus Willd. In open woodlands. 
117. E. virginicus L. Common along streams. 
118. E. canadensis L. Common in moist fielas and along streams. 
119. E. rohustus Scribn. & Sm. Common in moist places. 
Hystrix. 
120. H. hystrix. Common in woods. 
CYPERACEAE. 
Cyperus. 
121. (7. diandrus Terr. In marshes. 
122. G. rivularis Kunth. Along streams. 
128. G. intlexus Mulil. Plenty along streams. 
124. G. schiceinitzii Torr. Rare. 
125. G. erythrorliizos Mulil. In wet meadows. 
126. (7. speciosus Vahl. Plenty in marshes. 
127. G. strigosus L. ^Cemmon in swamps. 
128. (7. filiculmis Vahl. Dry fields. 
Eleochaeis. 
129. E. atrcpurpurca (Retz.) Kunth. Plenty in marshy places. 
180. E. palustris (L.) R. & S. 
181 E. palustris, glaucesceris (Willd.) Gray. 
182. E. acicularis (L.) R. & S. 
SCIEPUS. 
188. S. americanus Pers. 
184. S. lacustris L. Common in marshes. 
185. S. fluviatilis (Torr.) Gray. Abundant along edges of streams. 
186. tS. atrovirens Muhl. Abundant in inarshj^ places. 
187. S. lineatus Michx. In swamps and marshes. 
Eriophorum. 
188. E. polystachyon L. Scarce in marshy places. 
189. E. gracile Koch. Rare in marshy places. 
Fuikexa. 
140. F. squarrosa Michx. Scarce in marshes. 
Hemicaepa. 
141. II. micrantha (Vahl.) Britton. Rare in marshes. 
Caeex. 
‘ 142. G. retrorsa Schwein. 
148. G. ' hystricina Muhl. Plenty in swamps. 
144. (7. comosa Boott. In swamps. 
145. G. trichocarpa Muhl. Plenty in swamps. 
146. (7. aristata R. Br. Scarcer than above species. 
147. G. lanuginosa Michx. Quite common in swamps. 
148. G. strict a, angustata (Boott) Bailej^ 
149. G. fuzca All. In wet places. 
150. G. aquatilis Wahl. Rare in marshy places. 
