214 FLORA OF THE GREEN RIVER GROUP. 



some of the present epoch. The others, Ficus arenacea, Zizypkus cinna- 

 momoides, Cissus protemfolia, Eucalyptus americana are peculiar types whose 

 affinity is not distinct. Juglans Schimperi is also represented in the Eocene 

 of Golden, and Ficus wyomingiana at Evanston. Therefore there is nothing 

 in this group of plants proving a relation to that of Florissant. From the 

 beginning of my researches I have been uncertain about the geological 

 relations of this flora. It is clear that from its character as exposed by 

 the few materials I have had for identification, I could but refer it to the 

 upper Miocene. 



The same may be said of the 14 species obtained by Professor S. II. 

 Scudder in Randolph County, Wyoming. Eight species, Flabellaria Floris- 

 santi, 3 species of Quercus, Popmlus balsamoides, Liquidambar europaium, 

 Cinnamomum Scheuchzeri, Zanthoxylum spireafolium, are identified in the 

 Miocene of Europe. Cyperites Haydenii, Acer indivisum, Celtis McCoshii, 

 Evonimus fiexifolms are peculiar types; while one species only, Amygdalus 

 gracilis, is represented at Florissant. 



The flora of Elko Station, represented by 15 species, is more dis- 

 tinctly related to that of Florissant, with which it has four species in com- 

 mon — Myrica calUcomcefolia, C'arpinus grandis, Planera longifolia, Piospyros 

 Copeana. Omitting Carpinus grandis, a common species of the Miocene of 

 Europe and America, the three others are truly leading types of the flora 

 of Florissant, where Myrica calUcomcefolia and Planera longifolia are rep- 

 resented by hundreds of specimens; the other, Piospyros Copeana, has 

 been found only at the two localities now compared. Of the other species 

 of Elko, Sapindus coriaceus is related to S. angustifolius of Florissant; three 

 species of Myrica and three Conifers of Elko indicate a predominance of 

 plants of these genera, represented at Florissant by fourteen species of 

 Myrica and seven Conifers. There is no relation whatever between the 

 flora of Elko and that of the Eocene, or of a lower stage of the Tertiary; 

 but five of its species, Fagus Fernonice, Salix media, S. elongata, Populus 

 Michardsoni, and Ficus Jynx are identified in the Miocene of Europe, and 

 one, Lycopodium prominens, is of a still more recent type. 



Of the 9 known species of the White River flora, 4 are at Florissant, 

 and these also are leading species — Planera longifolia, Myrica acuminata, 

 M. rigida, and M. longifolia. A fifth, M. Ludivigii, is so intimately related 



