30 
Bulletin of the Unversity of Texas 
r. Fruit an ellip- 
Pies! rire 
aboutone inch 
LON 2263s ee 
s. Leaves thick, 
fruit an acorn. 
(3) Blade of leaf serrate or notched. 
(a) Veins of leaves straight not 
prominently branched. 
x. Trees with thorns, fruit a 
DOME Senco. Sas. Se peice 
y. Trees without thorns. 
(x) Leaves oblique at 
base, fruit a circular 
samara, leaves harsh 
to the. COUCh e+ see 
(y) Leaves not oblique at 
base. 
m. Leaves rounded or 
somewhat  heart- 
shaped at base 1-2 
16” A AON: are ke 
fruit a globular 
drupe % inch in 
qiameter Fass s ae: 
n. Leaves thin, buds 
long sharp pointed, 
bark smooth, fruit 
a bur with two tri- 
angular shaped 
MMS oh er eS seme ees 
o. Leaves thin, the 
bark of the trunk 
peeling off in thin 
papery leaves...... 
p. Leaves thin, flower 
in? “Carkinss -inak 
HO Paliike mace 2 ese 
q. Leaves thin, fruit 
a catkin with large 
leaf like bracts. 
trunk of tres 
PTDOVEE aye ee ent es 
r. Leaves thicker 
than the preceding, 
fruit an oval shap- 
ed woody cone..... 
Page 
Letinera..). sae 53 
Quercus: .s:25 sh 63 
Cratseeus” 4.226 105 
ATMS = 54% Fee 94 
Planera. «oscar 97 
Macus, 04% 5 aire 62 
Betula . 3: eee 61 
GOstryacckieleee 59 
Carprnus” Atenas. 60 
ANS... bee shee 61 
