H2 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, Reppert ; 

 Storm Lake, Bessey. 



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, Rcppcrt ; Linn county, 

 Shimek; Lake Okoboji and Fort Dodge, Hitchcock. 



2. P. amplifolius Tuck. Am. Jour. ScL, 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 countv. C ratty; Muscatine, Rcppcrt ; Spirit Lake, 

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



3. P. nuttallii Ch. & Sch. Linnaea, II., 226 (1827). 



P. pennsyivanicus 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., y^)\ Real and Wheeler, FL Mich.. 145. 



