IOWA ACADEMY OP SCIENCES. 
105 
NAIADACE^. 
Potamogeton pennsylvanicus QhMR. In water, frequent. 
P. fluitans Roth. In streams, frequent. 
P. mucronatus Schrad. In still water, frequent. Mr. Cratty 
writes, “probably this, but too imperfect for correct determina 
tion.” 
CYPERACE^. 
Cyperus diandrus Torr. Low sandy ground, frequent. 
C. diandrus Torr. , var. castaneus Torr. With the last, prob- 
ably rare. 
G. aristatus Rottb. Low sandy ground, common. 
G. schweinitzil Torr. Sandy ground, frequent. 
G. Jiliculmis Vahl. Sandy soil, infrequent. 
G. esculentus L. Low ground and cultivated fields, frequent. 
G. strigosus L. Low, sandy ground, frequent. 
Eleocharis ovata R. Br. Wet ground, infrequent. 
E. palustris R. Br. Wet ground, abundant. 
E, acicularis R. Br. Wet ground, abundant. 
Scirpus lacustris L. Swamps, common. 
S. atrovirens Muhl. Wet ground, common. 
Eriophorum cyperinum L. Low ground, frequent. 
E. polystachyon L. Wet ground, rare and variable. 
Gar ex lupulina Muhl. Sloughs, frequent. 
G. retrorsa Schwein. Miss Ona M. Rounds, coll. Deter- 
mined by Mr. Cratty. 
G. stricta Lam. Sloughs, common. 
G. stricta Lam. , var. decora Bailey. Sloughs, infrequent. 
G. longirostris Torr. Low sandy ground, frequent. 
G. aquatilis Wahl. Wet -ground in mud or water, frequent. 
The plants examined were young. 
G. laxiflora Lam. Some doubt as to habit, and Mr. Cratty 
writes that is an unusual form of the species. 
G. pedunculata Muhl. Shaded bluffs, infrequent. 
G. varia Muhl. Mr. Fernald says the plant was too young 
to be certain. 
G. pennsylvanica Lam. Woods and prairies, common. 
G. stipata Muhl. Wet ground, common. 
G. vulpinoidea Michx. Miss Ona M. Rounds, coll. Deter- 
mined by Mr. Cratty. 
G. rosea Schkuhr. Woods, common. 
