(201 ) 



Cup more or less turbinate ; acorns 

 elongated ovoid. 



26. Q. turbinella. 

 Leaves strongly reticulate beneath. 



21. Q. Arizonica. 

 Leaves broadly obovate, usually over 6 cm. long. 



22. O. reticulata. 

 Leaves in age glabrous beneath. 



23. Q. oblongifol ia . 

 Scales of the cup thin, only slightly thickened on the back. 



Leaves not fulvous. 



Leaves ovate or lanceolate, in age glabrous, obscurely 



reticulatc-venulose. 24. Q. Emoryi. 



Leaves oval, oblong or ovate-oblong, puberulent be- 

 neath, decidedly reticulate- venulose. 



2 5- Q- Toumeyi. 

 Leaves more or less fulvous, especially when young. 

 Leaves oblong to oval or ovate, usually sinuate spinu 

 lose-dentate, strongly reticulate beneath ; cup more 

 or less turbinate. 26. Q. turbinella. 



Leaves, except those of the young shoots, broadly oval or 

 ovate, subentire, abruptly acuminate, not strongly re- 

 ticulate ; cup hemispheric. 27. Q. Wilcoxii. 

 ** Acorns sericeous-tomentose inside, biennial. 



Leaves lanceolate, long-attenuate, entire or merely toothed, white-tomen- 



tose beneath. 28. Q. hypolcuca. 



Leaves pinnately lobed with spinose-tipped triangular lobes, green and 

 glabrous on both sides or pubescent on the veins beneath. 



29. Q. Texana. 



i. Quercus macrocarpa Michx. Hist. Chenes Am. No. 2. 



1801. 



This well-known oak does not reach the Rockies as far as 

 I know. Professor Sargent claims that it is found in the 

 " eastern foothills of the Rocky Mountains of Montana." I 

 have spent three summers in that region, and Mr. R. S. Wil- 

 liams half his life in the State, but neither he nor I have found 

 any oaks there. It is found in the Black Hills of South Da- 

 kota and Wyoming, but that is to my knowledge as far west 

 as it extends. Its range seems to be from Nova Scotia to 

 Lake Winnipeg, eastern Assiniboia, Black Hills, Central 

 Texas, Tennessee and Pennsylvania. In the Black Hills 

 and western Nebraska, it fruits at a height of two meters. 



