FOSSIL FLORA. 773 



an uprig-ht Tnmk. 4 feet iii (liaineter; oolleoted Ijy F. IL Kiidwlton, August 

 22, 1887 



QUERCINHM KNOWI/IONI Felix. 



Qiicrcinium knoirltoni Felix: Undersucbuiig iiber fossile Holzer: Zeitscbr. d. Deutsc-li. 

 geol. (iesell.. Jalir. ISitG, p. 250. PL YI, fig. 2, 189G. 



As stated uiidcr the preceding- species, these 2 forms may l)e identi- 

 cal, l)ut in al)sence of full drawings of Q. hiioickoin it seems l)est 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. 



JUOI.OGICAT., COKSIDERATIOX OF THE TEIJTIARY FLOKA. 



The Tertiar\- Hora of the Yellowstone National I'ark jiossesses great 

 biolog-ical interest. It is a rich flora, and ou comparing it with the living- 

 flora it becomes apparent tliat g-reat climatic changes nuist haAe taken })lace 

 since the close of the Miocene period to have made these modiflcati(jns in 

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

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

 families, with the nundier of species or forms referred to each:' 



.Species. Speries. 



Filices 10 Phitanacepe 3 



Equisetacew 4 Lcf/n m inosw 5 



Gonifera- 13 Anacardiaoe;v 1 



Typhucew 1 Celastrace;e 4 



Sparganiacea? 1 Aceracew 2 



Cyperacew 4 SapiudaceiV o 



Smilacew . . 1 Bhumnutrw 4 



Mnsacea^ 1 Yitacea- 1 



Juglaudacea' 8 Stercnliacea' 1 



Myricaceie 3 C'rediieriacea^ 1 



Saiicacew 10 Tiliaeea- 2 



Betulacew 2 Araliacea- G 



Fagacea? lo Comacea' 2 



Uliuace* 5 Ericacav 1 



Urticttcea- 10 Ebenaeea; .* 3 



Maguoliacea^ 5 Oleacea' 1 



Lauracetb .- . 12 Phyllites, Carpites 3 



' The orders that ;ire also founil in tlir present flora are printed in italicH. 



