LIST OF HIGHER SEED-PRODUCING PLANTS. 229 
Q., Ont. to Brit. Col.; N. to lat. 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. 
HeErs.: Ballard 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. Pl. III, 479 (1872); Engler in Engler and Prantl, Nat. 
Pylanz. 3, II, 10 (1888). 
Genera: 1; cosmopolitan; except in arctic and ant- 
artic regions. 
Species: 8; in standing water, lakes and ponds. 
CERATOPHYLLIUM Linn. Gen. 725 (1787). 
Hydroceratophyllum VarmLu. Act. Par. (1719). 
Dichotophyllum Diu. 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; 8 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. 8. 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. Ross. 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. and Fla. 
Minn. valley: Reported from N. E. district; lakes and 
ponds. Aquatic. 
XLI. RANUNCULACEAE. Crowfoot Family. 
Endlicher, Gen. Pl. 843; Benth. and Hook., Gen. Pl. I, 1 (1862); 
Prantl, Engler and Prantl, Nat. Pflanz. 3, IV, 43 (1888). 
