FLORA OF THE GKEEN EIVEE GROUP. 183 



River Group. The leaves of Ulmus are on the contrary very abundant at 

 Florissant and other localities of the North American Tertiary where fossil 

 plants have been obtained. 



STAPHYLEACE^. 



STAPHYLEA. Linn. 

 "U. S. Geol. Rep.," vii, p. a67. 



Staph J lea acuminata, Lesqx. 



Plate XXXVI, Figs. 1-4. 

 Ibid., p. 2G7, pi. xlviii, figs. 4,5. 



The species is not rare at Florissant, but generally the leaves are 

 defaced by maceration and their characters obscurely defined. 



FRANGULACEtE. 



EVONYMUS. Tourn. 



Leaves opposite, petiolate, ovate, serrate or dentate, piniiately nerved; secondary 

 nerves camptodrome or efl'aced in tlie reticulation toward tlie border.s. 



Ten fossil species of tliis genus are described from the European 

 Tertiary, mostly from the Miocene. 



E V o 11 y lu u s tl e X i f o 1 i u s , sp. nov. 

 Plate XXXVni, Fig. 13. 



Leaves large, ovate-acuminate from an oval base, flexuous at the apex, narrowed 

 from the middle to the petiole, sharply deeply serrate; secondary nerves alternate, 

 equidistant and parallel, cami)todrome. 



The leaf without the petiole is 16i centimeters long, 5 centimeters 

 broad in the middle, where it is oval-oblong, narrowed upward to a long 

 flexuous acumen and more rapidly to the petiole, which is 3 centimeters 

 long. The teeth of the borders are turned upward, equal, becoming short 

 toward the acumen, deeply cut; the nervation is truly camptodrome, the 

 veins being effaced near the borders and not entering the teeth directly as 

 it is incorrectly figured. 



This leaf has the characters of Evonpniis Proserpince, Ett., '"Bil. Fl.,"' 

 iii, p. 30, pi. xlviii, figs. 6, 7. It is of the same size and shape, more grad- 



