204 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



the Pliocene of California, this species is, per contra, represented by small 

 leaves, which jjreserved in full show distinctly their inequilateral base, a 

 peculiar character of this species. I have no doubt, however, on the iden- 

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

 Figs. 1 and 2 of pi. xxxii, and also tig. 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 author. Besides the inequality 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 different species. Ficus lilanicostata 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. 



Habitat. — 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 found in the Pliocene flora 

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

 Lake may correspond to this last station. 



Ficns pseudo-pop u Ins, Lesqz. 

 Plate XXXIV, Figs. 1 a, 2. 

 Fieas 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 acnte 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 ZizTjphus by the form of the leaves, a Populus by its entire 

 borders and long petiole, a Ficus by the areolation, as marked in fig. 2 b. It 

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



