74 THE LATER EXTINCT FLORAS OF NORTH AMERICA. 



p. 55, PL LXXVII, fig. 16); but from all these it may be distinguished by 

 its coarse, generally obtuse, marginal denticles. 



Formation and locality: Tertiary (Eocene?). Tongue River, Montana. 



Quercus elliptica Newb. 



PI. XVIII, fig. 1; XX, fig. 3. 



Bost. Journ. Nat. Hist., Vol. VII (1863), p. 523. 



"Leaves elliptical or ovate, rounded or somewhat wedge-shaped at 

 base, pointed above; margins entire. Surface smooth, consistence thick 

 and leathery; nervation strong; lateral nerves numerous, diverging at a 

 large angle, slightly arched upward, often sinuous, forked and anastomosing 

 above." 



In its nervation this species resembles several of the laurel-leaved oaks 

 already described from the Tertiary rocks of Europe, such as Q. nereifolia, 

 Q. Heerii, Q. elaena, etc., but is distinguishable from all these and other 

 otherwise similar species by its broad elliptical or ovate outline. The 

 margins in the specimens before us are apparently entire, but they are 

 probably sometimes toothed, as in most allied species. 



Formation and locality: Cretaceous (Puget Sound group). Chuckanutz, 

 near Bellingham Bay, Washington. 



Quercus flexuosa Newb. 



PL XIX, figs. 4-6. 



Bost. Journ. Nat. Hist., Vol. VII (1863), p. 521. 



"Leaves 4 to 6 inches long, lanceolate, often more or less curved, 

 pointed, acute, narrowed at the base to the petiole; margins somewhat 

 irregularly sinuate-dentate; nervation strongly marked, lateral nerves 

 forked and anastomosing at the summit." 



This is apparently one of the chesnut oaks, but has not the regularity 

 of nervation which characterizes most of that group, of which Q. castanea 

 may be taken as a type. 



Among fossil species there are many to which it bears considerable 

 resemblance, such as Q. Gaudini Lesq., Q. Gmelini Ung. Q. uroplvylla Ung\, 

 etc., but from these and all others described it seems to be sufficiently 

 distinct. In Q. Gaudini the secondary nerves are curved and run along 



