270 UNITED STATES GEOLOGICAL SURVEY— TERTIARY FLORA. 



South America, and ii few to Madeira and Asia. Ten species belong to 

 the United States; none to California, however. The ancient history of the 

 genus is followed in Europe from the Upper Cretaceous of the Gypses of 

 Aix, through the Armissan, to the Miocene and the Pliocene, where, in the 

 small group of plants of Maximicux. we find one species which the authors 

 compare to /. Bakarica, Desf., and /. Cnnariensis, Poir. One species only has 

 been left in the flora of Europe. As yet, the few fossil species which we have 

 observed in the Western Tertiary of Colorado are from specimens of the 

 Green River group and of the Parks, considered as Upper Miocene. 



Ilex V y o tn i Ii g I ft 11 a , sp. nov. 



Plate L, Fig. 1. 



Leaf oblong, uairowed to .lu obi use poiut; midrib tbick; lateral nerves lew, distant, canipto- 

 drome ; borders undulate-crenate. 



The fragment representing this species is incomplete, the lower part of 

 the leaf being destroyed. It seems cuneate to the base. The borders are 

 regularly undulate or subcrenate; the lower secondary nerves, on one side at 

 least, are more acutely diverging from the midrib, ascend higher, and anasto- 

 mose near the borders with branches of the upper veins. This nervation is 

 analogous to that of /. Ahichi, Heer (Fl. Tert. Helv., p. 73, pi. cxxii, fig. 21), 

 vvliich has the leaves sparingly crenulate like ours, but ol' a different, broader, 

 and rather broadly oval shape. The substance of tliis leaf is subcoriaceous. 



Habitat. — Green River, Wyoming {Dr. F. V. Hayden). 



Ilex! af f i n iH, Lesqz. 



PlateL, Figs. 2,3. 



U(X affinis, Lesqx., Supplement to Annual Report, 1871, p. 8. 



Leaves coriaceous, oblong-ovato, broadly cuneate to tbe base, borders irregularly distantly den- 

 tate ; nervation subcainptodrome. 



These leaves, inequilateral at the base, seem like pinnules of a com- 

 pound leaf The midrib is thick, the secondary veins numerous, parallel, 

 inequidistant, and, at an open angle of divergence, either enter the point of 

 the teeth, and, by thin branches, follow the borders in festoons, or are truly 

 camptodromc, with nervilles passing up from the back of the curves into the 

 teeth. Tliis nervation is not in conformity with that of the leaves of the 

 dentate section of I/ex; it is rather analogous t(j that of some Oak leaves. 

 The coriaceous substance of the leaves prevents a reference to Qncrcus. I 



