FLORA OF THE GREEN RIVER GROUP. 155 



is 5 centimeters long and nearly 3 centimeters broad in the middle. It is 

 broken at the apex, but appears as tapering to a short acumen. The lat- 

 eral nerves, 5 or 6 pairs, at an angle of 40°, are thin, flexuous, campto- 

 drome, following the borders and joined to some of the teeth by anasto- 

 mosing veinlets; nervilles flexuous or transversely curved. 



Species related to Quercus larguensis, Sap., "Et.." iii, 1, p. 67. pi. 5, 

 fig. 1, which has the same form, the borders irregularly cut-dentate. 



Hah. — Florissant. Princeton Museum, No. 797. 



Quercus castaneopsis, sp. nov. 



Plate XXVIII, Fig. 10. 



Leaves large, lanceolate, gradually acuminate, regularly distantly dentate; lat- 

 eral nerves parallel, at an open angle of divergence, the lower joining the medial 

 nerves at right angles, all camptodrome, curving in passing to the boixlers, following 

 them and entering the short teeth by oblique nervilles; areolation of minute polygonal 

 meshes. 



This leaf may represent a Castaneopsis. I do not know of any fossil 



species to which it may be compared. 



Hah.— Randolph Co., Wyoming. U. S. Geol. Expl. Dr. F. V. Hayden. 



§ 2. Leaves entire. 



Quercus elsena, Ung. 



Plate XXVIII, Figs. 11,13. 



Ung., "Chlor. Protog.," p. 112, pi. xxxi, fig. 4; Heer. "Fl.Tert. Helv.," ii, p. 47, pi. lxxiv, tigs. 11-14; lxxv, 

 fig. 1 ; iii, p. 178, pi. cli, figs. 1-3; Sap., "fit.," ii, p. 85, pi. iii, fig. 11; iii, p. 65, pi. ii, figs, 5-9; 

 v, fig. 2. 



Leaves coriaceous, short-petioled, oblong-lanceolate; borders entire, revolute or 

 reflexed; lateral nerves camptodrome. 



The leaves vary from 5 to 7 centimeters long and from 1 to li centi- 

 meter broad. Those figured here especially resemble the figures in Sap., 

 loc. cit., pi. ii, figs. 5-10. 



Hal.— Florissant. U. S. Geol. Expl. Dr. F. V. Hayden. 



Quercus neriifolia, Al. Br. 

 Plate XXXI, Fig. 12. 

 " U. S. Oeol. Rep.," vii, p. 150, pi. xix, figs. 4, 5. 



I refer with doubt to this species a subcoriaceous polished leaf 10 

 centimeters long, 22 millimeters broad in the middle, whose borders are 



