Ko. 2256. F0S8IL PLANT 8 FROM OKLAHOMA— BERRY. 629 



sant species. From this it would seem that the Oklahoma plants 

 were of somewhat similar age to those of Florissant, the different 

 physical conditions combined with the much less effective methods of 

 preservation accounting for the sparseness of the flora recognized 

 from Oklahoma. I believe that this is substantially true, and I am 

 inclined to regard the Oklahoma outcrop as of upper Miocene age, 

 although there is no conclusive evidence in existence that such a 

 valley flora may not have continued in this region during the early 

 Pliocene, there being no considerable American Pliocene floras, ex- 

 cept that of the Gulf coast,^ with which to make comparisons. 



Subclass MONOCOTYLEDONAE. 

 Order GRAMINALES. 



Genus CYPERACITES Schimper. 



CYPERACITES, species. 



Fragments of the foliage of an undeterminable species of a grass 

 or sedge are not uncommon in the collection. Similar remains are 

 not uncommon at many Upper Cretaceous and Tertiary outcrops 

 and are without significance beyond indicating the presence of this 

 order of plants. 



Genus CAULINITES Brongniart. 



CAULINITES, species. 



Fragments of the impression of a rhizome of a grass or sedge are 

 present in the collection. The impressions are 8 mm. in diameter, 

 with nodes about 4 cm. apart, and indicate a grass or sedge of con- 

 siderable size. Similar remains are not uncommon throughout the 

 Tertiar3\ 



Subclass DICOTYLEDONAE. 

 Order SALICALES. 



Family SALICACEAE. 

 Geuus SALIX Linnaeus. 



SALIX, species. 



Several fragments of an undeterminable species of willow are con- 

 tained in the collection. These represent a form with entire leaves 



1 Berry, E. W., U. S. Geological Survey Prof. Paper 98 L, pp. 193-208, pis. 44-47, 1916. 



