LIST OF HIGHER SEED-PRODUCING PLANTS. 229 



Q., Ont. to Brit. Col; N. tolat..57; U. S., except Pac. coast 

 reg. and far S. W. Yellowstone Park to W. Tex. 



Minn, valley: Throughout in ponds, lakes and sluggish 

 streams; often semi-terrestrial in flats and sloughs. 



HERB. : Bollard 457, Prior's lake, Scott Co. ; Sheldon 

 320, Madison Lake; Taylor 81, Elysian; Taylor 315, Janesville; 

 Kassube 20, Minneapolis; Sandberg 46, Vasa. 



XL. CERATOPHYLLACEAE. Hornwort 



Family. 



Benth. and Hook., Gen. PL III, 415 (1880); Endiicher, Gen. PL 267 

 (1840); Baillon, Hist. PI. Ill, 479 (1872.; Engler in Engler and Prantl, Nat. 

 Pflanz. 3, II, 10 (1888). 



Genera: 1; cosmopolitan; except in arctic and ant- 

 artic regions. 



Species: 3; in standing water, lakes and ponds. 



CERATOPHYLLUM LINN. Gen 725 (1737). 

 Hydroceratophyllum YAILL. Act. Par. (1719). 

 Dichotophyllum DILL. Gen. 91 (1719). 



Baillon, Hist. PL III, 495; Benth. and Hook., Gen. PL III, 382; Du- 

 rand, Ind. Gen. Phan. 382; Schenck, Palaeophyt. 632. 



Living species: 10 described; 3 reduced; perhaps only 

 1; cosmopolitan. 



Fossil species: C. vulgaris in Forest Bed of Cromer 

 (Schenck)? 



Ceratophyllum demersum LINN. Spec. 992 (1753). 



Wats, and Coult., Gray's Man 6 ed. 488; Britt., Fl. N. J. 228; Chap., 

 Fl. S. St. 398; Mac., Fl. Can. I, 459; Coult., Fl. Colo. 328; Wats., Fl. Calif. 

 II, 78; Upham, Fl. Minn. 122; Led., Fl. Ross. II, 123; Nym., Fl. Eur.;. 

 Hook., Fl. Gt. Brit. 378; Herd., Fl. Eur. Boss. 52; Wats., King Exp. 319;' 

 , Cov., Fl. Ark. 221; Hart., Fl. Scand. I, 384; Webb., Appx. Neb. 27; Greene, 

 Fl. Fran. 230. 



Europe and mid. Russ. to Caucasus; all Siberia to 

 Japan. 



North America: Ont., Sault Ste. Marie and L. Winni- 

 pegoosis to Washington, S. Calif, and Nev. ; E. across cont. to 

 N. Eng., N. J. andFla. 



Minn, valley: Reported from N. E. district; lakes and 

 ponds. Aquatic. 



XLI. RANUNCULACEAE. Crowfoot Family. 



.Endiicher, Gen. PL 843; .Benth. and Hook., Gen. PL I, 1 (1862); 

 Prantl, Engler and Prantl, Nat. Pflanz. 3, IV, 43 (1888). 





