FOSSIL FLORA. 



I (6 



an upright trunk, 4 feet in diameter; collected by F. H. Knowlton, August 

 22, 1887 



QUERCINIUM KNOWLTONI Felix. 



Quercinium Jenowltoni Felix: Undersuclmng fiber fossilo Holzer: Zeitschr. d. Deutscli. 

 geol. Gesell., Jalir. 1896, p. 250, PI. VI, fig. 2, 1896. 



As stated under the preceding species, these 2 forms may be identi- 

 cal, but in absence of full drawings of Q. knowltoni it seems best to regard 

 them as distinct. The size and shape of the ducts certainly differ greatly. 



Habitat: Amethyst Mountain, Yellowstone National Park; collected 

 by J. Felix in 1888. 



BIOLOGICAL COXSIDERATIOX OF THE TERTIARY FLORA. 



The Tertiary flora of the Yellowstone National Park possesses great 

 biological interest It is a rich flora, and on comparing it with the living 

 flora it becomes apparent that great climatic changes must have taken place 

 since the close of the Miocene period to have made these modifications in 

 plant life possible. The fossil flora embraces about 150 forms that have 

 been distributed among 33 natural families. Following is a list of these 

 families, with the number of species or forms referred to each: 1 



Species. 



Filiees 10 



Equisetacece 4 



Coniferw 13 



Typhacew ,. . 1 



Sparganiacere 1 



Cyperacece 1 



Smilaeece . . .. 1 



Musacese 1 



Juglandacea; 8 



Myncace* 3 



Salicacece 10 



Betulacew 2 



Fagacea; 1.5 



Ulinaceae - 5 



Urtirnceir 10 



Maguoliaceae 5 



Lauraceae 12 



Species. 



Platauaceaj 3 



Legum inosce 5 



Anacardiaeea- 1 



Celastraeea* -4 



Aeeracecc 2 



Sapindace;e 5 



Rhamnacece 4 



Vitaceai 1 



Sterculiacea; 1 



Credneriacea' 1 



Tiliacese 2 



Araliacea' 



Comacew 2 



Ericacece 1 



Ebenaceae :! 



Oleaceae 1 



Phyllites, Carpites 3 



1 The orders thai are also found in the present flora arc printed in itali 8. 



