200 
IOWA ACADEMY OF SCIENCES. 
Eleocharis. 
89. E.palustris (L.) K. & S. Ponds and swamps; fre- 
quent. 
90. E. acicularis (L.) R. & S. Abundant in wet ground. 
91. E. intermedia (Muhl.) Schultes. Borders of ponds 
and swamps; abundant. 
SCIRPUS. 
92. S. lacustris L. Swamps and streams; abundant. 
93. S. fiuviatilis {Torr.) Gray. Swamps; common. 
94. S. atrovirens Muhl. Swamps and along streams; 
abundant. 
Eriophorum. 
95. E. polystachifon h. Wet meadows; frequent. 
Hemicarpha. 
96. H. micrantha (Vahl.) Brit. {H. snhsqiiarrosa Nees.) 
Muddy banks of streams; infrequent. 
Carex. 
97. C. lupulina Muhl. Swampy woods; scarce. 
98. C. lupulina hella-villa (Dew.) Bail. With the type; 
the two forms are quite different in appearance, 
but intergrade perfectly. 
99. C. monile Tuck. Common in bogs and wet meadows. 
100. C. hijstricinaM.u\i\. Wet ground, meadows or open 
woods; frequent. 
101. C. pseudo-cyperus L. Swampy ground; infrequent. 
102. C. comosa Boott. [C. pseudo-cyperus americana 
Hochst.) Shallow muddy ponds; scarce. 
103. C. trichocarpa Muhl. Frequent in swamps and wet 
meadows. The species appears to be exceed- 
ingly variable. Our specimens are tall and very 
slender, with narrow, loosely flowered spikes 
and large perigynia; very different in every way 
from the following. 
104. C. aristata R. Br. (C. trichocarpa aristata Bail.) 
Common in swamps. 
105. C. lanuginosa Michx. (C. jiliformis latifolia Boeck.) 
Frequent in swampy meadows. 
