1924] Extensions of Range and new Variety in Salix 141 
is missouriensis also, and equally probably came from the nearby 
Missouri River at Bismarck. 
Local collectorsin the Dakotas and adjacent Minnesota can do much 
to determine the range of this and other species of equally doubtful 
distribution. 
SALIX PETIOLARIS IN THE DAKOTAS. 
Salix petiolaris J. E. Smith is another species of which the western 
limits of range are but little known. Recent manuals of botany 
give the western limit in the United States variously as “ Wisc.,”’ 
“Great Lakes,” “ Ill.," and “S. D.," and its range in Canada variously 
s “N. W. Ter." “Man.,” and “Sask.” The South Dakota ref- 
erence is given by Rydberg! but upon what authority is not known 
to the writer. MacMillan? states that it occurs in the * N. E. and S. 
E. district" of the Minnesota Valley, which would confine it to the 
eastern portion of southern Minnesota. 
In Iowa, petiolaris occurs across the northeastern third, as far west 
as Webster and Emmet (Cratty) Counties. 
Salix petiolaris is widely distributed in Minnesota, as recent 
collections indicate. In the herbarium of the writer are specimens 
from Anoka (Metcalf 1325), Stearns (Over 15442), and Chippewa 
(Moyer 401) Counties, which show a range practically across the 
State from east to west just north of Minneapolis and one-third of 
the way from the southern boundary to the Canadian line. It also 
contains 4 specimens from the vicinity of Cass Lake, Cass County 
(Pammel et al 14, 502, 583, 589), in the north-central part. 
In North Dakota, the writer's herbarium shows specimens from 
Hankinson, Richland County (V. Bailey), Lake George, McHenry 
County (Mabbott 417), and Birchwood in the Turtle Mountains of 
Rolette County (V. Bailey). In the National Herbarium there are 
specimens also from Butte, Benson County (Lunell, and Under- 
wood, McLean County (Metcalf 413). 
If a straight line be drawn from Webster County, Iowa, the most 
southwestern station for petiolaris in the State, northwest to McLean 
County, in central North Dakota, most southwestern outpost of the 
species in that State, the line will pass at some distance to the south 
west of Chippewa County, Minnesota, and Richland County, North 
1Rydberg, Per Axel. Flora of the Rocky Mountains and adjacent Plains 195. 
1917. 
2MacMillan, Conway. The Metaspermae of the Minnesota Valley. Geol. & Nat. 
Hist. Surv. Rept. Bot. Ser. 1: 183. 1892. 
