154 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



side, and tapering to a point (?) (broken). The only difference remarked 

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

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

 however, sharply pointed and unequal. The secondary veins are exactly of 

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

 todrorae, 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. s2)inosa for example, which, however, are not thick. 

 Habitat. — Six miles above Spring Caflon, Montana, with Cinnamomum 

 lanceolatum, Rhamnus rectinervis, etc. {Dr. F. V. Hayden). 



<t u e r c II s C I e b u r 11 i , Iiesqx. 



Plate XX, Fig. 2. 



Quercus Clebumi, Lesqx., Annual Eeport, 1873, p. 399. 



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

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

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

 figures given of that Quercus 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 the secondary veins. 



Habitat. — Black Buttes, Wyoming. 



Qnci'cusl fraxini folia, Lesqx. 

 Plate XX, Fig. A. 

 Qtuircus Laharpi, Gaad. — Lesqx., Annual Report, 1871, p. 297. 



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

 abtusely dentate point; secondary veins close, numerous, curving in passing up to the borders, campto- 

 drome. 



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 



