NOTES ON THE AQUATIC PHENOGAMS OF IOWA, j^j 



2. S. axdrocladl'm [Engelm.) Morong Bull. Torr. Dot. 



Club. XV, 78 (1888). 



S. simplex Huds. var. androcladum Engelm. in Gray's 



Man.. 5th ed., 481 (1867). 



Wats, and Coult, Gray's, Man. 6th ed.. 548; Arthur, FL 

 Iowa. 30: Macmillan, Metas. Minn. VaL, 33. 



Heads when mature about one inch in diameter, being 

 intermediate in size between the preceding and the next. 

 Ponds: rare. July. August. 



Davenport. Arthurs FL Ioua. Xo. 775; Wilton, Hitchcock. 



3. S. eurycarpum Engelm. Gray's Man.. 2nd ed. (1852). 



Wats, and Coult.. Gray's Man, 6th ed, 548; Arthur, Fl. Iowa, 

 30; Hitchcock. Ames Fl. 521 : Macmillan, Metas. Minn.Val, 33. 



Frequent throughout the state on the margin of ponds and 

 lakes, usually being found among a rank growth of grasses 

 and sedges. Mature heads of fruit are often 1 y 2 in. in diam- 

 eter. July. August. 



Emmet county. C ratty : Iowa City, Macbride; Ames, Hitch- 

 cock: Humboldt. Bessey: Hamilton county, Rolfs: Dickinson 

 county. Hitchcock : Washington and Winnebago counties, 

 Cedar Rapids. Shimek. 



NAIADACE^. 



XAIAS Linn. Spec. PL, 1015 (1753). 



1. X. flexilis ( Willd. \Rost. & Schmidt, Fl. Sed. 384 (1824). 



Morong. Xaiad. X. A, 59: Wats, and Coult, Gray's Man, 

 6th ed.. 566; Macmillan. Metas. Minn. VaL, 40; Hitchcock, 

 Ames FL. 523: Arthur, FL Iowa, 30. 



A homely little plant, growing entirely under water, and 

 widely distributed throughout the northern hemisphere. Ponds 

 and slow streams. July, August. 



Lake Cairo, Bessey: Emmet county. C ratty: Story and 

 Dickinson counties, Hitchcock; Muscatine Reppert; Hancock 

 county. Shi nick. 



