jA 2 NATURAL HISTORY BULLETIN. 



ZANNICHELLIA Linn. Spec. PL, 969 (1753). 



1. Z. palustris Linn. Spec. PL, 969 (1753). 



Morong, Naiad., N. A. 57; Wats, and Coult., Gray's Man., 

 6th ed., 565; Arthur, Fl. Iowa, 30; Hitchcock, Ames FL, 

 523; Upham, FL Minn., 136. 



A graceful aquatic with capillary stems, sparsely branched; 

 flowering and ripening its fruit under water. Cosmopolitan. 

 Ponds, and slow streams. 



Ames, not uncommon, Hitchcock; Muscatine, Rcp-pcrt; 

 Storm Lake, Bcsscy. 



POTAMOGETON Linn. Spec. PL, 126 (1753). 



1. P. natans. Linn. Spec. PL, 126 (1753). 



Morong, Naid. N. A. 13; Wats, and Coult., Gray's Man., 

 6th ed., 558; Arthur, Cont. FL Iowa, III.; Macmillan, Metas. 

 Minn. VaL, 34. 



Ponds and slow-flowing streams; fruit maturing in August 

 which should be especially collected of all species of the genus. 



Lake township, Muscatine county, Reppert; Linn county, 

 Shimek; Lake Okoboji and Fort Dodge, Hitchcock. 



2. P. amplifolius Tuck. Am.Jour. Sci., 2, VI., 225 (1848). 



Morong, Naiad. N. A., 16; Wats, and Coult., Gray's Man., 

 6th ed., 561; Upham, Fl. Minn., 136; Arthur, Fl. Iowa, 30; 

 Beal and Wheeler, Fl. Mich., 146. 



Slow flowing streams; rather rare. 



Emmet county, Crafty ; Muscatine, Reppert: Spirit Lake, 

 Hitchcock; Tama County, Sirrine; Charles City, Arthur. 



3. P. nuttallii C/i. & Sch. Linhaea, II., 226 (1827). 



P. fennsylvanicus Ch. & Sch. Linn., II., 227 (1827). 

 P. claytonii Tuck. Am. Jour. Sci. and Arts. 1st Ser.. 

 XLV.,38 (1843). 

 Morong, Naiad. N. A., 18; Wats, and Coult , Gray's Man., 

 6th ed., 559; Beal and Wheeler, Fl. Mich., 145. 



