154 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



siilo, and tapering to a jniint (?) (broken). The only difference remarked 

 between this leaf and the one fignred by Hecr {loc. cit., pi. li, fig. 11), is in 

 the size of the teeth, which are shorter in the American form ; they are, 

 however, sharply i)ointed and unequal. The secondary veins are exactly of 

 the same character as in Heer's species, branching toward the borders, camp- 

 todrome, with intermediate, short, tertiary veins, sometimes on a more open 

 angle of divergence. These leaves, even if their identification with the Mio- 

 cene species of Europe were positively ascertained, do not seem to be refer- 

 able to Oaks. By their small, sharp teeth, their unequal base, their nervation 

 also, they closely resemble the leaflets of some compound leaves, like those 

 of some Aralia, our A. sjnnosa for example, wliich, however, are not thick. 

 Habitat. — Six miles above Spring Canon, Montana, with Cinna?fiomum 

 lanceolatum, Rhamnus rectinei'vis, etc. {Dr. F. V. Hat/den). 



Q ti e r c II s C I e b u r ii i , Lesqz. 



Plate XX, Fig. 2. 



Quercua Clebnrni, Lesqx., Annual Report, \fi73, p. 399. 



Leaf coriaceous, linear-oblong, narrowed to the base, obtusely dentate; secondary veins sbort and 

 obsolete, nearly at right angle to the midrib. 



The upper part of the only leaf which represents this species being 

 destroyed and the nervation obsolete, its characters are indefinite. Its pecu- 

 liar form and nervation, however, and the flat, slightly obtuse teeth of the bor- 

 ders, even the unequilateral base, are characters identical with those of Quercus 

 urophylla, Ung. (Fl. v. Sotzka, p. 33, pi. ix, fig. 9). As in our species, also, 

 the lateral veins arc in right angle to the midrib. From the numerous 

 figures given of that Quercns by the German author, the leaves are seen to 

 be extremely variable, especially in the characters of the denticulation of the 

 borders and the direction of tlie secondary veins. 



Habitat. — Black Buttes, Wyoming. 



Quercus? f raxinif olia, Lesqz. 

 Plate XX, Fig. 3. 

 Qito'cus Laharpi, Gaud. — Lcs(jx., Annual Report, 1871, p. 297. 



Leaves membranaceous, lanceolate, rounded and narrowed to the entire base, tapering to the 

 obtusely dentate point; secondary veins close, numerous, cuiving in passing up to the borders, cauipto- 

 dronie. 



This leaf, known only from one specimen, is about eight centimeters 

 long, two centimeters broad in its lower part, entire from the base to near the 



