392 BOTANICAL GAZETTE [NOVEMBER 
While the Black Hills have always been recognized as belong- 
ing to the Rocky Mountain system, and as having a flora allied 
to that of the Rocky Mountain region, it will be noted that the 
four willows reported by RyDBERG are all eastern species. They 
range from the North Atlantic and the New England states west- 
ward across the great interior valley. S. Bebbiana extends com- 
monly and S. fluviatilis less commonly into the Rocky Mountain 
region itself, but primarily they are eastern species. The question 
of the identification of the specimens collected is not raised at this 
point. 
Another list which includes the Black Hills district was published 
by WILLIAMs,° presumably in 1895. The willows of the state, 
10 in number, include the 4 of RypBERG’s Black Hills list and also 
3 others credited to the Black Hills. It does not appear from this 
publication that herbarium specimens of all the species were ob- 
tained. WILLIAMS refers frequently to RYDBERG’s collections from 
the Black Hills and was doubtless familiar with a manuscript copy 
of his list. The 3 additional species credited to the Black Hills 
are as follows: 
“18, YELLOW WILLOW (Salix flavescens Nutt.)—A shrub found in the 
Black Hills. It may be recognized by the nearly entire leaves which are 
downy, or smooth and dull green above, and pale with a rufous pubescence 
beneath” (p. 106). No reference is made to any collections. 
“to, Harry wittow (Salix glauca villosa Anders.).—. ... Found at 
various places in the Black Hills and on the Yellow Bank in Grant County” 
(p. 106). 
90, PRAIRIE WILLOW (Salix humilis Marsh.).—A small shrub reported 
from the Black Hills by Mr. RypBERG” (p. 107). In no case is herbarium 
material cited. Again the question of identification is waived for the time. 
A third list covering the territory of the Black Hills in South 
Dakota was published by SauNpERs.’ The striking thing about 
this list is that it does not include two of the three additional willows 
credited to the Black Hills by Wrrttams, namely, S. flavescens 
and S. glauca villosa. It does list S. humilis, but as occurring only 
6 WittiaMs, T. A., Native trees and shrubs. S.D. Exper. Sta. Bull. 43. 1895 
(pp. 105-107). 
7 SauNDERS, D. A., Ferns and flowering plants of South Dakota. S.D. Exper. 
Sta. Bull. 64. 1899 (pp. 134, 135). 
