( J 99) 



tion borrowed from the Missouri Botanical Garden. In his 

 Texas Manual, Professor Coulter places both J^. undulata and 

 «^J. Gambdii under the Live Oaks, stating, however, that 

 they have deciduous leaves ; it is most surprising, however, 

 that he placed Gunnisonii as a variety of J^ undulata and not 

 of J£j Gambelii ; he evidently did not take time to give a per- 

 sonal investigation to the matter. 



Key to the Species. 

 * Acorns not scriceous-tomentose inside, annual (except perhaps in No. 27). 

 t Leaves lobed or divided, not evergreen ; lobes rounded, obtuse or acute, 

 but not spinulose-tipped. 

 Leaves bright green, early deciduous. 



Upper scales of the cup with caudate prolongations. 



1. Q. macrocarpa. 

 Upper scales of the cup not prolonged. 



Mature leaves softly pubescent, almost velvety beneath, 

 deeply divided. 

 Scales of the cup thin, not much thickened on the 



back. 2. 0. submollis. 



Scales of the cup corky-thickened on the back. 



3. Q. Utahensis. 

 Mature leaves glabrate, puberulent or somewhat pubescent 



but not velvety beneath. 

 Cup flat, covering less than one-fourth of the acorn. 



4. Q. Vreelandii. 

 Cup hemispheric, covering one-third to one-half of 



the acorn. 

 Acorns barrel-shaped, obtuse. 



Mature leaves very thin, glabrate beneath or 

 puberulent only on the veins ; cup cover- 

 ing about one-half of the acorn. 



5. Q. leptophylla. 

 Mature leaves firm, puberulent beneath ; cup 



covering about one-third of the acorn. 

 Leaves mostly oblong in outline, lobed half 

 way to the midrib or less, rather dull. 



6. Q. Gunnisonii. 

 Leaves obovate in outline, divided deeper 



than half way to the midrib, very 



shining above. 

 Lobes of the leaves broadly oblong, 



rounded at the apex. 



7. Q. nitescens. 



Lobes of the leaves ovate or triangular, 



acute. 



8. Q. Novo-Mexicana. 



