NOTES ON THE AQUATIC PIIEN'OGAMS OF IOWA. 



143 



Not before reported from Iowa. Ponds and slow streams 

 along Cedar River near Muscatine. June 25, 1894. Not 

 common. Ilcrh. J^cppcrt, A^o. 738. 



4. P. LONCHiTES Tuck. /Vm. Jour. Sci. and Arts, 2nd Ser., 



VII., 348 (1849). 

 P. fiuitaii^ Auc. Amer. 

 {t)P.fiti/(nis Roth. Fl. Cierm., I., 72 (1788). 



Morong, Naiad. N. A., 20; Wats, and Coult., Gray's Man., 

 6th ed., 560; Macmillan, Metas. Minn. Val, 34; Arthur, Fl. 

 Iowa, 30. 



Slow-flowing streams; common. Forms of this species 

 with the petioles of the submerged leaves 6 to 8 in. long were 

 collected by Mr. Reppert in the Mississippi River near Mus- 

 catine. 



West Fork of the Des Moines at Estherville, C ratty ; x\mes, 

 streams around Cairo Lake, HitcJicock: ponds and sloughs 

 along Cedar River, Reppert ; lowii City, Linn and Lee coun- 

 ties, Shiuiek; Charles City, Arthur: Storm Lake, Bessey : 

 Waterloo and Spirit Lake, Hitchcock ; Hamilton county, Rolfs. 



5. P. HETEROPHVLLUs Schrcb. Spic. Fl. Lips. 21 (1771). 



P. graiiiiiieiis, var. hefcrophytliis Fries. Nov. 2nd ed., 



35 (1828). 



Morong, Naiad. N. A., 23; Wats, and Coult., Gray's Man., 

 6th ed., 561; Hitchcock, Ames Fl., 522; xMacmillan, Metas. 

 Minn. Val ,35. 



An extremely variable species, preferring quiet water; rare 

 within our limits. When the ponds and sloughs dry up this 

 species often sends up shoots bearing several broad green 

 leaves, in this respect resembling P. /'ninoois/s. 



Sloughs near Armstrong, Emmet countw Crafty: Ames, 

 rare, Hitchcock. 



6. P. iLLiNOENsis Morong. Bot. Gaz , V., 50 (18S0). 



Morong, Naiad. N. A., 27; Wats, and Coult., Gray's 

 Man., 6th ed.. 561; Macmillan, Metas. Minn. Val., 36; 

 Arthur, Cont. Fl. Iowa, V.; Hitchcock, Ames, Fl.. 522. 



