1915] BALL—WILLOWS 393 
in the eastern part of the state. The reasons for omitting these 
three willows can be guessed only. Either specimens were not 
found in the herbaria examined or they proved to belong to other 
species than those listed. It is a fair guess that S. humilis was 
included by Wit.tAms on the strength of RvpBERG’s® identification 
of his no. ro19 from Rochford, of which he says: 
A few specimens with thick leaves as in S. humilis and S. tristis were col- 
lected at Rochford, altitude 1700 m., July 12. Even these have been referred 
to S. rostrata by Mr. BEsp (no. 1019). 
At any rate, the list of Black Hills willows was again reduced 
to four species. So far as publications are concerned, the number 
seems still to rest there, though in 1912 PERISHO and VISHER?® 
reported Salix lutea, a western species, as being “fairly common 
along brooks”? in Washington ‘County, which adjoins the Black 
Hills on the southeast. 
On September 19, 1908, the writer studied and collected the 
willows occurring along Whitewood Creek from the railroad station 
upstream for a mile or more. Five species were found. Two of 
them, S. lutea Nutt. and S. prinoides Pursh, were very common in 
the floodplain of the stream. Of each of the remaining three, 
S. Fendleriana Anderss., S. Scouleriana Barr., and S. Bebbiana 
Sarg., only a single plant was found. All three were obtained in 
the edge of the city. An examination of RypBERG’s specimens 
showed that .S. lutea was the species reported as S. cordata by him, 
while S: prinoides was the basis of his record for S. discolor. The 
finding of S. Scouleriana bears out the statement quoted from 
Witttams under S. flavescens, which is a synonym. This is the 
first recorded collection of S. Fendleriana in the Black Hills. It 
occurs commonly in the canyons of the Rocky Mountains and 
westward at elevations of 5000 feet and over. The number of 
species was now increased to six. 
Collections of S. amygdaloides, S. fluviatilis, and S. cordata 
were made also at Bellefourche on the same date, but as Belle- 
al cit., p. 523. 
, E. C., and Visuer, S. S., The geography, gd and seer of 
south Hii oak ako. State Geol. and Biol. Survey Bull. 5 
