60 



TREES AND SHRUBS 



Scales of the cup corky-thickened on the 

 back; leaves fulvous beneath, gla- 

 brate above. 

 Acorn large; mature leaves all more 

 or less conspicuously toothed, re- 

 sembling those of 0. fendleri. 

 Acorn of medium size; only the 

 younger leaves conspicuously 

 toothed. 

 Leaves large obovate, strongly re- 

 ticulate; teeth small and nu- 

 merous; fruit in a long pedun- 

 culate spike. 

 Leaves of medium size, oblong, only 

 slightly reticulate, entire or with 

 few coarse teeth. 

 Leaves and twigs of the year 

 glabrous in age; leaves rarely 

 with any teeth. 

 Leaves permanently densely stel- 

 late-pubescent beneath, also 

 the twigs of the year. 

 Cup shallow, acorn acute. 



Cup deep, covering one-third the 

 acorn; acorn truncate or ob- 

 tuse. 

 Leaves chlorophyll green, not coriaceous (ex- 

 cept slightly so in No. 16) deciduous in 

 the fall, hence the plant leafless in winter. 

 Leaves coarsely serrate toothed with nu- 

 merous teeth from base to apex, not 

 truly lobed. 

 Leaves more or less sinuately lobed. 

 Low shrubs, never forming trees; leaves 

 small, 3 inches long or less. 

 Lobes few and shallow, appearing as a 

 few large teeth; some of the leaves 

 obovate in outline. 

 Lobes deeper and more numerous; 

 leaves oblong in outline. 

 Acorns very large, about 1 inch long; 

 a plant of the southeastern sand- 

 hills. 

 Acorns small, % an inch long or less, 

 racemose; plant of the mountains 

 of the northern part of the state. 

 Taller shrubs or trees with larger, deeply 

 lobed leaves mostly 4 inches long or 

 more. 

 Mature leaves soft pubescent and al- 

 most velvety beneath. 

 Scales of the cup thin, little thickened 

 on the back; leaves distinctly 

 obovate in outline. 

 Scales of the cup thickened on the 

 back; leaves mostly oblong only 

 slightly broadened upwards. 



9. Q. confusa. 



13. Q. reticulata. 



10. 0. oblongifolia. 



12. Q, arizonica. 



11. Q. grisea. 



14. Q. muhlenberj/H. 



15. Q. media. 



16. Q. havardii. 



17. Q. venustula. 



18. Q. submollis. 



19. Q. utahensia. 



