38 FLORA OF THE MONTANA FORMATION. 
Salix angusta Al. Br. 
PI. VII, fig. 6. 
Salix angusta Al. Br. Cf. Heer, Fl. Tert. Helv., Vol. II, p. 30, PI. LXIX, figs. 1-11 
(1856); Lesquereux, Ann. Rept. IT. S. Geol. and Geog. Surv. Terr. 1871, Suppl., 
p. 6 (1872) ; ibid., 1872, p. 405 (1873) ; ibid., 1873, p. 384 (1874) ; ibid., 1876, p. 506 
(1878); Tert. Fl.,p. 168," PI. XXII, figs.*4, 5 (1878); Cret. and Tert. FL, pp. 157, 
247, PI. LV, fig. 6 (1884); Proc. U. S. Nat. Mns., Vol. XI, p. 13 (1888). 
Iii its European distribution this species is mainly Miocene. It has 
been identified by Lesquereux from a number of localities in the 
United States, ranging in age from the Montana formation and the 
true Laramie to the Eocene or possibly the Miocene. It was first 
detected in the Green River group, occurring near the town of Green- 
river above the so-called " fish beds." Fragmentary specimens referred 
to this species were also obtained from the locality known as "6 miles 
above Spring Canon, Montana," now called the Bozeman coal field. 
The recent collections from the latter place contain a large number of 
more or less fragmentary examples in which the nervation is mainly 
obsolete, and which are consequently referred to this species with some 
hesitation. There can be no doubt, however, that they are the same as 
the specimens regarded by Lesquereux as belonging to S. angusta, but 
their absolute identity with the European forms is by no means so 
clear. 
This species is also reported by Lesquereux from Wickliffe, Ballard 
County, Kentucky, in the so-called Eo-Lignitic or Lower Eocene. This 
identification depends upon a single imperfect leaf, and must also be 
open to more or less question. 
This species was found at Point of Rocks, Wyoming, by Professor 
Ward. The example figured lacks both base and apex, yet it agrees as 
closely as do others that have been referred to this form. In fact, it 
may be said that the leaves of this willow are so often poorly preserved 
and without positive characters that its value as a stratigraphic mark 
is of little importance. 
Habitat. — Coalville, Utah, and Point of Rocks, Wyoming (north of 
station and midway of cliff) ; collected by Lester F. Ward, September 
3, 1881. Bozeman coal field, Montana, both in true Laramie and 
Livingston formations. Greenriver, Wyoming (above the fish beds). 
Wickliffe, Ballard County, Kentucky. 
Salix Stantoni n. sp. 
PI. VI, fig. 6. 
Leaf evidently of firm texture, elliptical-lanceolate in outline, rather 
abruptly narrowed to a rounded, obtuse base, and narrowed above to 
an obtuse apex; margin entire; petiole not preserved; midrib rather 
thick, straight; secondaries about eight pairs, alternate or subopposite, 
