220 DISTRIBUTION OF THE PLANTS. 



of the Territories." These plants have to be separately recorded, and this 

 is done in the table of distribution, where it is seen that the analogy of 

 their types is with plants of different groups from the Eocene up to the 

 upper Miocene, even to species of our epoch. 



The third group is that of Carbon, whose flora is typically allied to 

 that of Alaska. The plants of Carbon have been all described in vol. vii of 

 the "U. S. Geol. Report," and those of Alaska have been described by Heer 

 in the 2d volume of the " Flora Arct." These species are merely enumer- 

 ated in the table of distribution, with the addition of some new ones found 

 in the collection of the U. S. National Museum, which were procured by 

 Dr. Wm. H. Dall, and have been described in Proceedings of the National 

 Museum, February, 1883. 



I have placed in a separate fourth group a number of Miocene species 

 procured from distant localities of California and Oregon. The specimens 

 which were intrusted to me for study by Professor J. D. Whitney are the 

 property of the University of California, to which they have been returned. 

 They were collected at diverse localities, and a limited number of speci- 

 mens from each. It will not be possible for the present to fix the age of 

 these plants otherwise than to say that they are all Miocene. The plants 

 are all figured in this volume, pis. 1 to lix. 



There are still a few vegetable fragments figured (pi. xlv B), obtained 

 at the Chalk Bluffs of Nevada County, California, which are partly Miocene 

 and partly Pliocene in character, and which merit a place in this memoir 

 in order to have all together the materials of the vegetable scale of the 

 North American Tertiary flora, as far as it is known at this time. 



