70 FLORA OF THE MONTANA FORMATION 
RHAMNUS SALIC1FOLIUS Lx. 
Ithamnus salicifolius Lx., Am. Jour. Sci., 2d ser., Vol. XLI, p. 206 (1868); Ann. Rent. 
U. S. Geol. and Geog. Surv. Terr., 1869, p. 196 (1869); ibid., 1872, p. 400 
(1873); ibid., 1873, p. 382 (1874); ibid., 1876., p. 517 (1878); Tert.. FL, p. 282, PI. 
LIII, figs. 9, 10 (1878). 
This species was first described from specimens obtained from Mar- 
shall's coal mine, Boulder County, Colorado. This type specimen is 
the original of fig. 9, PI. LIII, of the Tertiary Flora. It is No. 446 
of the United States National Museum collection, but, unfortunately, it 
can not be found at the present time. There is in its place another 
specimen with the same number, which may have been the counterpart 
of the one figured, although, as it is very fragmentary, it is impossible 
to be sure of this. It is exactly like fig. 9 (loc. cit.) in its characters, so 
far as can be made out, and is preserved in the whitish sandstone 
characteristic of the locality. 
The other figured type (Tert. Fl., PL LIII, fig. 10) is said by Les- 
quereux to have come from Black Buttes, Wyoming, at which place it 
was obtained by Professor Meek (Ann. Kept. 1872, p. 400), but as the 
Museum catalogue, made up by Lesquereux, does not record this 
species from Black Buttes, this is probably an error. But as the type 
of this figure can not be found among specimens of this species from 
any other locality, it is impossible to do anything but ignore it until it 
is found or is again collected from the locality mentioned. 
The Museum catalogue records a specimen from Golden, Colorado, 
which is evidently the one referred to by Lesquereux in the Annual 
Report for 1873, page 382. It is No. 837a, and is preserved on the same 
stone with Salix Integra Gopp. (No. 837). The matrix is a hard, fine- 
grained, whitish sandstone, not unlike that from Marshall's coal mine, 
and undoubtedly belongs to the true Laramie. A specimen is also 
recorded from the roof of a coal mine on Sand Creek, Colorado (now 
known as Coal Creek). This example (No. 935) bears the impression 
of two leaves which are very much larger than the figured specimens, 
being 11 or 12 cm. long and 4 or 5 cm. wide, whereas the largest type 
(as figured) is 9.5 cm. long and only 2 cm. wide. The base is also dif- 
ferent, being broader and less wedge-shaped. It is doubtful whether 
they really belong to this species. 
The only other specimen recorded in the Museum catalogue (No. 936) 
is said to have come from " Basaltic rocks, Yellowstone." This spec- 
imen is missing, and is disregarded in the present discussion, especially 
as abundant recent collections from Yellowstone Park do not contain it. 
The material obtained by Lakes in Colorado fortunately contains a 
number of fairly well-preserved fragments of this species from the 
coal mine on Coal Creek, Boulder County, Colorado, not far, it is con- 
jectured, from the type locality, as they agree most closely with the 
figured specimen from that place. 
The material collected by Mr. T. W. Stanton and myself near Har 
