64 Bulletin of the University of Texas 



lobed (Chestnut Oaks). 



a. Acorns sessile. 



(1) Leaves obovate, small tree or 



shrub . 5 Q. prinoides. 



(2) Leaves oblong to lanceolate, 



sometimes obovate 6 Q. Muhlenbergii. 



b. Acorns borne upon stalks about as 

 long as the leaf petiole. 



(1) Leaves densely hairy below.... 7 Q. Michauxii. 



(2) Leaves smooth below 8 Q. Brayi. 



3. Leaves entire, undulate, or lobed only 



near apex. 



a. Cup saucer-shaped, thin, leaves hairy 



beneath 9 Q. Durandii. 



b. Cup saucer-shaped, leaves smooth, 



cup thick 10 Q. Laceyi. 



B. Leaves persistent until the appearance of 

 the new leaves of the following year, 

 mostly evergreen. 



1. Leaves entire on mature branches, 

 sometimes serrate on young twigs, 



dark green, southeastern species 11 Q. Virgiana. 



2. Leaves spinulate toothed to entire, dark 



green, western species 12 Q. Emory i. 



3. Leaves sinuate lobed not toothed 13 Q. breviloba. 



4. Leaves light or blue green, hairy be- 

 neath when old, entire wavy or lobed. . 14 Q. undulata. 



5. Leaves light or blue green, smooth be- 

 neath when old, entire wavy or lobed. . 15 Q. oblongifolia. 



II. Leaves or their lobes mostly tipped with 



bristles, fruit maturing the second season . . Black Oaks. 



A. Leaves persistent, densely white, downy 



beneath 16 Q. hypolerica. 



B. Leaves deciduous. 



1. Leaves deeply cut or lobed. 



a. Leaves lobed to about the middle, 

 lobes wedge shaped; cup of acorn, 

 saucer shaped, thick, about %-inch 



broad 17 Q. rubra. 



b. Leaves lobed to beyond the middle 

 or sometimes a few of them not as 

 deeply lobed. 



(1) Cup of acorn saucer shaped, thin, 

 enclosing the nut for about 1/3 

 its length; leaves dull above, 

 cup about % ' broad 18 Q. Schneckii. 



