LIST OF HIGHER SEED-PRODUCING PLANTS. 181 
Minn. valley: N. E. and N. W. districts ; dry hills, 
banks of streams and woods. 
HERB.: Oestlund 180, Hennepin Co.; Bailey 2a, Hunt- 
er's island. 
Populus tremuloides Micax. Fl. N. Am. II, 248 (1808). 
P. trepida WiLuLp. Spec. IV, 803 (1805). 
P. atheniensis Hort. ex Koch, Dendrol. II, 486 (1873). 
P. tremuliformis Em. Trees of Mass. 243 (18:8). 
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; Roth., Wheel. 
Exp. 41, 242. 
North America: Newf. and Labrador to Hudson Bay 
and Alaska; 8. 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. 
HeRsB.: Ballard 227n, Jordan, Scott Co.; Sheldon 47, 
Elysian; Taylor 481, Janesville; Bailey 158, Vermilion lake; 
Sandberg 519, Cannon Falls; Herb. Sheld. 1770, Minneapolis; 
Alerb. Moyer 225, Montevideo. 
SALIX Linn. Gen. 742 (1787). 
Benth. and Hook., Gen. Pl. III, 411; Durand, Jnd. 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, ete. (Nathorst, Warming, Steen- 
strup), 15-20 sp. 
Salix myrtilloides Linn. Spec. 1446 (1753). 
S. arbuscula PALL. FI. Russ. II, 83 (1788). 
S. elegans Bess. Enum. 77 (1822). 
S. pedicellaris Hoox. FI. 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. Russ. 118; Engl. Pax, 
Nat. Pflanz. ITI, 1, 37; Led., Fl. Ross. III, 613; Hart., Fl. Scand. 1, 369; 
Rothr., Alask. 454. 
Russia and Siberia. 
North America: N. Br. and Atl. coast to Coast range; 
