LIST OP HIGHER SEED-PRODUCING PLANTS. 181 



Minn, valley: N. E. and N. W. districts ; dry hills, 

 banks of streams and woods. 



HERB. : Ozstlund 180, Hennepin Co. ; Bailey 2a, Hunt- 

 er's island. 



Populus tremuloides MICHX. PL N. Am. II, 243 (1803). 

 P. trepida WILLD. Spec. IV, 803 (1805). 

 P. atheniensis HORT. ex Koch, Dendrol. II, 486 (1873). 

 P. tremuliformis EM. Trees of Mass. 243 (18 i 8). 



Wats, and Coult., Gray's Man. 6 ed. 486; Britt., Fl. N. J. 227; Mac., 

 Fl. Can. I, 456; Webb., Fl. Neb. 110; Upham, Fl. Minn. 130; Coult., Fl. 

 Colo. 339: Wats., Fl. Calif. II, 91; Wats., King Exp. 327; Both., Wheel. 

 Exp. 51, 242. 



North America: Newf. and Labrador to Hudson Bay 

 and Alaska; S. to Sacramento valley and N. Mex. ; E. to N. 

 Eng., N. Ky., N. J. and Penn. 



Minn, valley: Throughout; damp woodland; near lakes 

 and along streams. 



HERB.: Bollard 227n, Jordan, Scott Co.; Sheldon 47 ', 

 Elysian; Taylor 481, Janesville; Bailey 158, Vermilion lake; 

 Sandberg 519, Cannon Falls; Herb. Sheld. 1770, Minneapolis; 

 Herb. Moyer 225, Montevideo. 



SALIX LINN. Gen. 742 (1737). 



Benth. and Hook., Gen. PL III, 411; Durand, Ind. Gen. Phan. 381; 

 Engler and Prantl, Nat. Pflanz. 3, I, 36 (Pax); Schenck, Palaeophyt. 463. 



Living species: 16U; all regions except Australia, Ma- 

 lay Archip. and Oceanica. Russia, 70; Europe, 60; N. Amer- 

 ica, 70; Canada, 60; E. Sts., 20; Rocky mts., 16; California, 23;. 

 S. Sts., 7; PL King, 7; PL Wheel., 9; Russian Europe, 58. 



Fossil species: Potomac, lower Cretaceous, 3 sp. (Fon- 

 taine) Salicophyllum upper Cretaceous, N. America, Asia and 

 Europe; Tertiary, abundant; Europe, Greenland, California; 

 Diluvial, abundant; peat bogs, etc. (Nathorst, Warming, Steen- 

 sirup), 15-20 sp. 



Salix myrtilloides LINN. Spec. 1446 (1753). 

 S. arbuscula PALL. Fl. Buss. II, 83 (1788). 

 S. elegans BESS. Enum. 77 (1822). 

 8. pedicellans HOOK. Fl. Bor.-Am. II, 150 (1840). 

 Wats, and Coult., Gray's Man. 6 ed. 485; Britt., Fl. N. J. 227; Upham, 

 Fl. Minn. 130; Mac., Fl. Can. I, 451; Herd., Fl. Eur. Buss. 118; Engl. Pax, 

 Nat. Pflanz. Ill, 1, 37; Led., Fl. Ross. Ill, 613; Hart., Fl. Scand. 1, 369; 

 Rothr., Alask. 454. 



Russia and Siberia. 



North America: N. Br. and Atl. coast to Coast range; 



