NOTES ON THE AQUATIC PHENOGAMS OF IOWA. 



139 



Iowa, 30; Hitchcock, Ames Fl., 522; Macmillan, Metas. 

 Minn. Val., 133. 



Proliferous like the rest of our Lcuniaccic. the flowers and 

 fruit being rarelv seen. In stagnant water; rarer than the 

 two following. 



Ames and Iowa City, Hitchcock; Marshalltown, Stezuart ; 

 Muscatme, Rcppert ; Linn county, Shimek; Ames (near the 

 var. orhiculata Austin), Bcssey. 



2. L. TRisuLCA L/'ini. Spec. PL. 970 (1753). 



Wats, and Coult.. Gray's Man.. 6th ed., 552; Arthur, Fl. 

 Iowa, 30; Hitchcock, x\mes FL, 522; Upham, Fl. Minn., 135. 



Common throughout the state, floating on stagnant water, 

 among other vegetation, often in dense mats. June, July. 



Emmet count}', Crattx : Iowa City and Cedar Rapids, Mac- 

 bride; Decorah, //^-i/zwv,- Kxw^^, Arthur, Bcssey : Spirit Lake, 

 Hitchcock: Muscatine, jReppert ; Hancock county, Shiijiek. 



3. L. POLYRRHiZA Li)in. Spec. PL, 970 (i753)- 

 Spirodela polyrrhiza Schleid, Linnea.% XIII.. 392 (1839). 



Wats, and Coult., Gray's Man., 6th ed., 552; Arthur, Fl. 

 Iowa, 30; Hitchcock, Ames FL, 521; Macmillan, Metas. 

 Minn. Val., 134. 



Very common throughout, floating on stagnant or slow 

 flowing water. July. 



Muscatine. Repfcrt ; Spirit \^?,\:.q. Hitchcock: x\mes, Arthur; 

 Decorah. Holzcav: Cedar Rapids and Iowa City. Macbride; 

 Emmet count}-, C ratty : Winnebago county, Shimek. 



Note. — L. pcrpiisilla Torr., Fl. N. Y., II., 245 (1843), should be looked 

 for in the eastern part of the state. 



WOLFFIA Horkcl. Linn. XIII., 389 (1839). 



I. W. BRASiLiENSis JVcdd. Ann. Sci. Nat. Ser., 3, XII., 157 

 (1849). 



Grant ia drasi/ien^iis (Wedd.) Macmillan, Metas. Minn. 

 Val., 134 (1892). 



