THE FLORA OF SCOTT AND MUSCATINE COUNTIES. 265 



848. P. Spin //us, Tuckerm. 



Shallow pond on Muscatine bland, July, 1894. (Mackenzie.) 

 1896. 



849. P.fluitans, Roth. 



Rivers, sloughs and ponds. Plants in the Mississippi River 

 have the submersed leaves over a foot long. 



850. P. amplifolius, Tuckerm. 



Ponds and sloughs along Cedar River; infrequent. July, 

 1894. 



851. P- Jllinocnsis, Morong. 



Muscatine Slough and ponds on Muscatine Island ; rather 

 frequent. 



852. P. zostercefo/ius , Schum. 



Ponds along Cedar River ; infrequent. 

 85 3- P- pauciflorus, Pursh. 



Ponds and sloughs ; rather frequent. 



854. P. pusilluSfT,. 



Ponds and sloughs along Cedar River ; not frequent. 



855. P. imicronatus, Schrad. 



Muscatine Slough and sloughs along Cedar River. 



856. P. pectina/us,~L. 



Ponds and sloughs ; not infrequent. 

 Zannichellia, Micheli. 

 857- Z- pa lus/ris, L . 



Ponds and sloughs of Muscatine county ; frequent. 

 Naias, L. 



858. N. f/exilis, Rostk. & Schmidt. 



Habitat and range of the preceding but less frequent. 



CYPERACECE. 



Cyperus, Tourn. 



859. C diandrus, Torr. 



Low grounds along Cedar River ; infrequent. 



860. C diandrus, Torr., var. castaneus, Torr. 

 Low grounds ; common. 



861. C aristatus, Rottb. 



Sandy soil along rivers ; frequent. 



[Proc. D. A. S., Vol. VIII.] 34 [Aug . , 4i igooi 



