134 METASPERMAE OF THE MINNESOTA VALLEY. 
North America: Atl. to Pac, in Can.; to lat 58° N.; 
8. to N. J. and W. to Minn., Neb. and N. Mex., Oregon and 
Calif. 
Minn. valley: Throughout; not infrequent; ponds and 
pools, floating on the surface. 
Hers.: Ballard 6/, Chaska; Sheldon 355, Madison Lake, 
Blue Earth Co.; Ballard 442, Prior’s lake, Scott Co.; Taylor 
218a, Lake Helena, Waseca Co.; Ballard 818, Page lake, Carver 
Co.; Ballard 680, Waconia. 
Lemna polyrhiza Linn. Spec. 970 (17538). 
Lenticula polyrhiza Lam. Fl. Fr. 189 (1778). 
Lemna orbicularis Kir. in Schult. Ostr. Fl. ed. 2, 64 (1814). 
L. thermalis BeAuy. in Nutt Gen. J, 19 (1818). 
L. major C. A.M. Ind. Caue. 11 (1831). 
L orbiculata Roxs. FI. Ind. IIT, 565 (1832). 
Speirodela polyrhiza SCHLEID. Linn. XIII, 392 (1839). 
Lemna bannatica KuNtTH, Enum. III, 7 (1841). 
Telmatophace polyrhiza GopR. Fl. Lorr. ILT, 18 (1844). 
T. orbicularis ScHUR. Enum. 635 (1866). 
Wats. and Coult., Gray’s Man. 6 ed. 552; Britt., Fl. N. J. 255; Upham, 
Fl. Minn. 135; Mac., Fl. Can. II, 75; Webb., Fl. Neb. 97; Wats., Fl. Calif. 
II. 190; Coult., Fl. Colo. 360; Chap., Fl. S. St. 443; Hook., Fl. Gt. Brit. 425; 
Nym., Fl. Eur.; Led., Fl. Ross 1V, 18; Richt., Pl. Eur. 175; Herd., Fl. Eur. 
Russ. 122; Engl., Nat. Pflanz. II. 3, 164; Mac., Fl. Can. II, 368; Wats., King 
Exp. 336; Cov., Fl. Ark. 228; Hart., Fl. Scand. I, 429. 
Europe—except Greece; Russia and Siberia; Australia; 
Madeiras; Central America and West Indies. 
North America: Same distribution as last. 
Minn. valley: Throughout; abundant; ponds and 
pools; floating on the surface. 
HerRs.: Ballard 441, Prior’s lake, Scott Co.; Ballard 
882, Waconia; Ballard 60, Chaska; Sheldon 724, Sleepy Hye. 
GRANTIA Grirr. Notul. III, 236 (1851) not Boiss. 
Wolffia HorkEt, ex. Schleid. Linn. XIII, 389 (1839), not Wultftia 
Neck. Elem. I, 35 (1790). 
Horkelia Retcu. ex. Bartl. Ord. Nat. 76 (1830), not Cham. and 
Schlecht. (1827). 
Bruniera FRANCHET, Billotia, 25 (1864). 
Benth. and Hook., Gen. Pl. II], 1001; Durand, Ind. Gen. Phan. 451; 
Engler and Prantl, Nat. Pflanz. 2, III, 164 (Engler). 
Living species: 12; Europe; EH. Indies; tropical Africa 
and America to Canada and Chile. N. America, 2 sp. 
Grantia brasiliensis (WEDD). 
Wolffia brasiliensis WEDD. Ann. Sci. Nat. ser. 3, NII, 157 (1849). 
Wats. and Coult., Gray’s Man. 6 ed. 553; Mac., Fl. Can. IT. 76. 
North Ainentoas With G. polusubicnnts, 
