FAGACE^E 



Leaves oblcng-obovate; cup of the fruit hemispheric, the scales often much 

 thickened. 46. Q. utahensis (F). 



Leaves oblong-obovate, deeply lobed; nut conic, elongated, inclosed for one- 

 third its length in the cup-shaped cup. 47. Q. lobata (G). 

 Leaves glabrate or puberulous below, oblong to oblong-obovate. 



48. Q. leptophylk (F). 

 Leaves glabrous below. 



Leaves oblong-obovate, usually 5-lobed. 49. Q. austrina (C). 



Leaves oblong-obovate, obliquely pinnatifid or 3-9-lobed. 50. Q. alba (A, C). 

 Leaves coarsely sinuate- toothed. CHESTNUT OAKS. 



Fruit on peduncles much longer than the petioles; leaves obovate or oblong- 

 obovate, generally sinuate-dentate or lobed, pubescent, and usually hoary on 

 the lower surface. 51. Q. tricolor (C). 



Fruit on peduncles about as long or shorter than the petioles. 



Leaves obovate or oblong-obovate, cuneate or rounded at the broad or narrow 

 base, tomentose or pubescent and often silvery white below. 



52. Q. Prinus (A, C). 



Leaves obovate or oblong to lanceolate, acuminate, with rounded or acute 



teeth. 53. Q. montana (A, C). 



Fruit sessile or nearly so; leaves oblong to lanceolate, acute or acuminate or 



broadly obovate, puberulous and pale, often silvery white on the lower 



surface. 54. Q. Muehlenbergii (A, C). 



i. Quercus borealis Michx. Red Oak. 



Leaves obovate or oblong, acute or acuminate, abruptly or gradually cuneate or 

 rounded at the broad or narrow base, usually divided about half way to the midrib by 





Fig. 221 



wide oblique sinuses rounded at the bottom into 11 or sometimes into 7 or 9 acute oblique 

 ovate lobes tapering from broad bases and mostly sinuately 3-toothed at apex with elongated 

 bristle-pointed teeth, or sometimes oblong-obovate, gradually narrowed and cuneate 

 at base, and sinuately lobed with broad acute usually entire or slightly dentate lobes, 

 when they unfold pink, covered with soft silky pale pubescence on the upper surface and 



