( 200 ) 



Acorns ovoid, acute ; cup covering about one-half 

 of the acorn. 9. Q. Gambelii. 



Leaves pale or bluish green, more persistent. 

 Leaves broadly obovate with narrow sinuses. 



10. Q. Eastwoodiae . 

 Leaves oblong-obovate, or elliptic ; sinuses broad. 



Lobes oblong-ovate, obtuse or acutish, not mucrouate. 



ir. Q. venustula. 

 Lobes triangular-ovate, mucronate. 



Cup 10-15 mm. in diameter ; acorn yellowish, ovoid. 



12. Q. Fendleri. 

 Cup 18-25 mm. in diameter ; acorn dark brown, spher- 

 ical-ellipsoid. 13. Q. Havardii. 

 If Leaves persistent, usually evergreen, entire, sinuate or dentate ; or if 

 deeper lobed with spinulose tips. 

 Leaves broadly obovate, undulate round-lobed. 



Leaves thick and reticulate, brownish stellate-pubescent be- 

 neath. 14. O. obtusifolia. 

 Leaves thin, less reticulate, almost silvery-puberulent beneath. 



15. Q. breviloba. 

 Leaves not broadly obovate (except in Q. reticulata); lobes, if any, 



acute, mucronate or spinulose-tipped. 

 Scales of the cup decidedly corky-thickened on the back. 

 All the leaves siuuately lobed or dentate all around. 



Leaves usually more than 5 cm. long, broadly oval or 

 ovate, 5-7-lobed ; cup 12-18 mm. broad. 



16. Q. pauciloba. 

 Leaves usually less than 5 cm. long, oblong or oval- 

 oblong ; cup 8-10 mm. broad. 



Leaves not fulvous. 



Leaves decidedly crisped, sinuately lobed; lobes 

 distinctly spinulose-tipped. 



17. 0. pungens. 

 Leaves flat, sinuately dentate ; teeth mucronate 



or slightly spinulose-tipped. 



18. Q. undulata. 

 Leaves more or less fulvous beneath especially when 



young. 26. Q. turbinella. 



Leaves mostly entire or undulate, or dentate above the mid- 

 dle. 

 Leaves permanently densely stellate-pubescent beneath. 

 Leaves oblong, usually less than 6 cm. long. 

 Leaves not strongly reticulate beneath. 

 Pubescence light gray, not fulvous. 



19. Q. Mohriana. 

 Pubescence more or less fulvous. 



Cup hemispheric; acorns barrel-shaped. 



20. Q. grisea. 



