1921] BALL—WILLOWS , [221 
3:19. 1887.—S. serissima (Bailey) Fernald, Rhodora 6:7. De- 
cember 28, 1903. 
When this species was established by FERNALD, in the very 
interesting and comprehensive article cited, he fully set forth its 
ecological characters and catalogued all available herbarium speci- 
mens. ‘These showed its range to extend westward from Connecti- 
cut to northern Ohio, Wisconsin, and northern Minnesota. The 
type locality in Minnesota, and the most westerly station then 
known, was Mud River, Vermillion Lake, Saint Louis County, 
lying in the extreme northeastern part of the state, about 75 miles 
north of Duluth. Rosrnson and FERNALD‘ extended the range to 
Alberta, while the writers has reported the species from Teton 
County, Montana. SCHNEIDER extends its range eastward to 
Newfoundland, north to the eastern shore of James Bay and the 
Severn River in Keewatin, and west to Edmonton, Banff, and 
Crow’s Nest Lake in Alberta. The specimens cited later extend 
the range southwestward to Pembina and Rolette counties in 
North Dakota, and to Flathead County in extreme northwestern 
Montana. Both the Montana specimens come from the east side 
of the Continental Divide. Teton County lies on the plains at 
the eastern base of the Rocky Mountains, at an average elevation 
of about 4000 ft. Choteau is on the Teton River, which arises in 
the high mountains, but here flows eastward through the plains to 
the Missouri River. The localities in North Dakota are a south- 
ward extension of the distribution in Manitoba, while those in 
Montana obviously represent a similar extension of its distribution 
in the mountains of Alberta. It is quite possible that further 
search will extend the range both north and south in the Rocky 
Mountains. The Kennicott specimen from Slave River extends 
the range far to the north of Edmonton, into Athabasca or 
Mackenzie. 
Montana.—Choteau County, Choteau, on Teton River, about 4000 ft. 
elevation, lat. 112°10’ W., Griffiths and Lange, August 22, 1900 (B); Flathead 
County, 3-4 ft. high in open marsh along Swiftcurrent Creek below Lake 
McDermott, alt. about 1350 m., P. C. Standley 16053, July 20, 1919 (B, N). 
4Rosinson and FERNALD, in Gray, New Man. Bot. 322. 1908. 
’ Bart, C. R., in Courter and Netson, New Man. Rocky Mt. Bot. 130. 1909. 
