NOTES ON THE AQUATIC PHENOGAMS OF IOWA. ^ 



Morong, Naiad. X. A.. 37; Wats, and Coult., Gr.iy's Man.. 

 6th ed.. 562: Macmillan, Metas. Minn. Val., 39; Arthur, 

 Cont. Fl. Iowa. III.; Hitchcock, Ames, Fl., 522. 



A beautiful plant with bright, smooth leaves. Shallow 

 water in lakes or slow streams. July. August. 



Vinton, Arthur's Cat.: Iowa Lake, Emmet county, Cratty; 

 Lake Okoboji and Ames. Hitchcock: Muscatine, Reppert; 

 Cedar Rapids. Iowa City. Hancock county. Shtmek. 



10. P. foliosus Raf. Med. Rep.. II., Hex. V., 354 (1808). 

 P. pauciflorus Pursh. Fl. Am.. L. 121 (1814 ). non Lam. 

 Fl. Franc. III.. 209 (1778). 



Morong. Naiad. N. A., 39; Wats, and Coult., Gray's Man., 

 6th ed.. 563: Arthur, Fl. Iowa, 30: Macmillan, Metas. Minn. 

 Val.. 39. 



A very variable species, usually growing entirely under 

 water, and widely distributed throughout the United States 

 and Canada. Morong in his JVaiadacece of North America 

 says, •• spikes about 4-flowered."' Emmet county, Iowa, speci- 

 mens determined bv him have the spikes 4- to 6-fruited. 

 Some of Mr. Reppert's specimens vary from the type in 

 having the spikes 6- to 10-fruited. in this respec 1 : approaching 

 the var. niagarensts (Tuck.) Gray. Similar forms were also 

 collected at Ames by Prof. Hitchcock. June. July. 



Shallow water in ponds and lakes, Emmet countv, Cratty; 

 Muscatine. Reppert; Iowa City. Lee, Hancock, and Linn 

 counties. Shi nick: Mt. Pleasant, Mills; Charles City, Arthur; 

 Grand Junction. Bessey; Dickinson and Woodbury counties,. 

 Hitchcock. 



Note. — P. obttisifolius Mert. and Kock. Deut. Fl., I., 855 (1823), has 

 been reported from this State, but I have not seen it Plants *o labeled 

 which I have seen are forms of another specie^. 



11. P. .major i Fries ) Morong. Naiad. X. A.. 41 (1893). 

 P. rut Has Auc. Amer. in part, non Schult.. Mant. III., 



362 (1827,. 



P.pusitlus Linn., var. major Fries. Nov. 48 (1828). 

 P. compressus Sm. Eng. Hot.. III.. 418 ( 1794 I, non Linn. 



