FLORA OF THE GREEN RIVER GROUP. 109 



species from Qlea Americana, its nearest relative, from which it differs by 

 smaller leaves and larger flowers. No trace of secondary veins is discern- 

 ible on those leaves. 



Nine fossil species of Olea are described by authors from the Miocene 

 of Europe, none of which have a marked relation to this. 



Hah. — Florissant. Princeton Collection, No. 641. 



"U. S. Geol. Rep.." vii, p. 228. 

 Ibid., p. 229, pi. xl, fig. 3. 



FRAXINUS, Tourn. 

 F rax in us prse dicta, Heer. 



F rax in us Heerii, sp. nov. 

 Plate XXXIII, Figs. 5, 6. 



Leaflets more or less uuequilateral, rounded or narrowed to the short petiole, and 

 equally so from the middle to the acuminate blunt apex ; borders undulate ; lower 

 secondary nerves at a more acute angle of divergence, all unequally distant, curving 

 and reticulate at a distance from the borders; nervilles flexuous, at right angles to the 

 medial nerve. 



The leaflets, 5 to 7 centimeters long, li to 2 centimeters broad, are, 

 evidently, part of a compound leaf, as seen from the lower lateral leaflet, 

 which is nearly sessile and very uuequilateral, and the upper a terminal 

 one. equilateral, larger and petioled. The lateral nerves are thin, arched 

 toward the medial nerve at a distance from the borders, as in Fraxiwus 

 prcedicta, Heer, "Fl. Tert. Helv.," pi. civ. figs. 12, 13, to which this species 

 is closely related ; indeed, it merely differs by the basilar nerves being at 

 a more acute angle of divergence, and those above with curves more dis- 

 tant from the margins which are merely undulate. No fruiting part has 

 been found. 



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



Fraxiuus mespilifolia, sp. nov. 



Plate XXXIII, Figs. 7-12. 



Leaflets more or less uuequilateral, ovate-lanceolate, obtusely acuminate, rounded 

 to a short petiole, obtusely serrate ; secondary nerves parallel, subequidistant, 8 or 9 

 pairs, much curved in passing to the borders and following them, connected with the 

 teeth by short anastomosing veinlets ; nervilles oblique, very flexuous. 



This species is as closely allied to F. juglandina, Sap., "Et.." iii. p. 89. 



pi. ix. figs. 13-16. as is the preceding to F.proedicta, Heer. The leaflets 



