34 METASPERMAE OF THE MINNESOTA VALLEY. 



Living species: 50 ; fresh and rarely brackish wa- 

 ters; cosmopolitan. Russia, 25; Europe, 38; N. America, 35 

 (15 endemic); California, 19; Canada, 27; E. Sts., 29; Rocky 

 Mts., 11; PL King., 10; PL Wheel., 4; S. Sts., 10. 



Fossil species: Tertiary; numerous forms described 

 but all rather doubtful; 2 sp. clearer than the rest. Oeningen 

 (A. Br.)-, S. France (Saporta). 



Potamogeton natans LINN. Spec. 126 (1753). 

 Wats, and Coult , Gray's Man. 6 ed. 553; Britt., Fl. N. J. 257; Webb., 

 Fl. Neb. 97; Upham, Fl. Minn. 136; Chap., Fl. So. St. 446; Wats., Fl. Calif. 

 II, 195; Mac., Fl. Can. II, 81; Coult., Fl. Colo. 362; Nym., Fl. Eur.; Led., 

 Fl. Ross. IV, 23; Hook., FL Gt. Brit. 431; Richt., PL Eur. 11; Herd., F,. 

 Eur. Russ. 124; Engl., Ascherson, Nat. Pflanz. II. 1 207; Wats., King Exp 

 337; Cov. Fl. Ark. 228; Hart, Fl. Scand. I, 431; Rothr., Alask. 445. 



Europe; Asia; Australia; Africa. 



North America: Anticosti, N. S., N. Br., Q., Ont., 

 Owen Sound to Man. and Lake Athabasca; N. to Hudson Bay 

 and Alaska; Vancouver; S. to Calif., Nev., Utah, N. Mex. ; E. 

 to N. Eng., N. J. and Fla. 



Minn, valley: Throughout; abundant; ponds, lakes 

 and sluggish streams. 



HERB. : Bollard, 782, Swan Lake, Carver Co. ; Bollard, 

 587, Crystal Lake, Scott Co. ; Bollard, 858, Page Lake, Carver 

 Co.; Bollard 276, Jordan, Scott Co.; Bollard 821, Belle Plaine; 

 Bollard 431, Prior's Lake, Scott Co. ; Sheldon 723, Cottonwood 

 river, near Sleepy Eye; Bollard 900, Waconia; Taylor 1072, 

 Douglas Co.; Sheldon 273, Duck Lake, Blue Earth Co.; Sheldon 

 1088, Springfield; Kassube 223, Rocky Lake; Herrick 281, Min- 

 ne tonka; Hohinger 265, Winona Co.; Bailey 391, Mud Lake; 

 Sandberg 531, Chisago Co. ; Herb. Sheld. 1693, Minneapolis. 



Potamogeton fluitans ROTH. FL Germ. I, 72 (1788). 



P. natans var. fluitans CHAM. Adnot. 4 (1815). 

 P. petiolaris PR. Del. Pr. I, 151 (1822). 



P. natans var. angustatus M. and K. Rohl. Fl. D. I, 836 (1823). 

 P. oblongus MET. Chlor. Hann. 519 (1836). 

 ?P. Imchites TUCKERM. Am. Jour. Sci. 2, VI, 226 (1848). 

 Wats, and Coult., Gray's Man. 6 ed. 560; Britt., Fl. N. J. 257; Upham, 

 FL Minn. 136; Mac., FL Can. II, 83, 369; Wats., Fl. Calif. II, 196; Coult , FL 

 Colo. 363; Chap., Fl. So. St. 446; Hook., FL Gt. Brit., 432?; Richt., PL Eur. 125 

 Herd., Fl. Eur. Russ. 124; Engl., Ascherson, Nat. Pflanz. II, 1, 207; Wats., 

 King Exp. 337; Hart., FL Scand. I, 431; Webb , Appx. Neb. 22. 

 All Europe: cosmopolitan. 



North America: N. Br., Ont. to N. J.; W. to Minn., 

 Iowa, Neb. , Mex. ; also Washington to Nevada. 



