204 U>:iTED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



the Pliocene of California, this s])ccies is, per oontrn. represented hy small 

 leaves, whicli preserved in full siiow distinctly their inequilateral base, a 

 pecnliar character of this species. I liave no doubt, however, on the iden- 

 tity of the American form, as represented in large leaves, with that of Europe. 

 Figs. 1 and 2 of pi. xxxii, and also fig. 8 of pi Ixiii, exactly correspond with 

 the two fragments figured by Heer (Fl. Tert. Helv., pi. cxlii, fig. 25), while 

 fig. 3 of pi. xxxii, though somewhat deformed, is like a representative of pi. 

 Ixxxiii, figs. 4 and 10, of the same authoi*. Besides the iijequality of the side 

 of the leaves, the species has, for its more general characters, the coarseness 

 of its surface, roughened by the impression of its deep, thick nerves, all camp- 

 todrome as well as their divisions, and curving quite near the borders, even 

 bordering them in their abrupt curves, as in the former species. This char- 

 acter is especially definite upon our fig. 3, which I was at first inclined to 

 consider as belonging to a diflerent species. Ficus phmicostata is very closely 

 related to this; but it has not been found with inequilateral leaves, and its 

 general appearance is different. It is, however, of the same type. 



Haritat. — Washakie Station, Wyoming; six miles above Spring Canon, 

 near Fort Ellis, Montana; near Yellowstone Lake, Wyoming, among basaltic 

 rocks; Point of Rocks Station, Wyoming; Evanston, Wyoming, above coal; 

 Fischer's Peak, Raton Mountains, New Mexico {Dr. F. V. Hayden). Sand 

 Creek, Colorado {Dr. A. B. Marvine): Found at the Gehrung Coal near 

 Colorado City; also at Black Buttes, but rare; more common at Golden. 

 Its distribution is, therefore; from the lowest stage of the Lignitic Eocene 

 to the highest Tertiary measures, as it has been fi)und in the Pliocene flora 

 of the gold-bearing gravel of California. The basaltic rocks of Yellowstone 

 Lake may correspond to this last station. 



Fie II 8 pseudo-populus, Lesqz, 

 Plate XXXIV, Figs. 1 a, 8. 

 Ficm pseudo-populus, Lesqx., Annual Report, 1874, p. 313. 



Leaves of medium size, oval, pointed, or acuminate, entire, narrowed downward to a long petiole, 

 palmately three-nerved from the base; lateral primary veins at an acute angle of divergence, ascending 

 to above the middle; secondary veins, two or three pairs, parallel to the primary ones, but at a great 

 distance above them ; divisions all camptodrome. 



This species is a remarkable one, resembling a Cinnamomum by its prin- 

 cipal nervation, a Zizyphus by the form of the leaves, a Fopulus by its entire 

 bordens and long petiole, a Ficus by the areolation, as marked in fig. Ih. It 

 is allied to F. Schimperi, Lesqx. (Trans. Am. Phil. Soc, xiii, p. 418, pi. xviii, 



