TREES AND SHRUBS 



61 



Mature leaves not velvety beneath, usu- 

 ally glabrate, sometimes slightly 

 pubescent, especially on the veins. 

 Cup saucer shaped, covering less than 

 one-fourth of the acorn. 



Cup hemispheric, covering one-third to 

 half the acorn. 



Acorns ovoid, acute; cup covering 



about half the acorn. 

 Acorns barrel shaped, obtuse. 

 Mature leaves thin, large, obovate 

 to cuneate, dark green above; 

 acorn very short, frequently 

 more than half in the cup. 

 Mature leaves firm, deeply lobed; 

 acorn about one-third in the 

 cup. 



Leaves oblong, lobed half way 

 to the midrib, dull-colored; 

 lobes usually simple. 



Leaves obovate in outline, lobed 

 more than half way to the 

 midrib, dark green above; 

 lobes frequently again lobed. 



20. Q. vreelandii. 



24. Q. gambelii. 



21. Q. leptophylla. 



22. Q. gunnisonii. 



23. Q. novomexicana. 



