A KEY TO THE TREES OF TEXAS 



Page 

 Leaves needle, scale, or awl shaped; fruit a cone 



of dry scales or a berry-like cone Pinaceae 33 



Leaves with expanded blades; fruit not as above. 

 I. Leaves compound. 



A. Leaves palmately compound. 



1. Leaflets 5 to 8 Aesculaceae .... 13 2 



2. Leaflets 3 Ptelea in 



Staphyllaceae . .126 



B. Leaves pinnately compound. 

 1. Leaves once pinnate. 



a. Leaves without an odd leaflet at 



the end, opposite, persistent Zygophyllaceae .125 



b. Leaves with an odd leaflet at the 

 end. 



(1) Leaves alternate. 



(a) Leaflets toothed or notched 

 all the way aroundi 



x. Trees with thorns Fagara in 



Rutaceae 125 



y. Trees thornless. 



(x) Fruit red drupes. . .Schmaltzia 1^9 



(y) Fruit a nut Juglandaceae ... 47 



(z) Fruit a trilobed 



capsule .Ungnadia in 



Sapindaceae ....138 



(b) Leaflets entire. 



x. Trees with thorns Fabaceae 121 



y. Trees without thorns, 

 (x) Fruit yellow drupes 



borne in clusters.. ..Sapindus 138 



(y) Fruit an elongated 



pod Fabaceae 121 



(c) Leaflets with one to four 

 gland tipped notches at 



base Ailanthus 127 



(2) Leaves opposite. 



(a) Leaflets, three evergreen. . .Heletia in 



Rutaceae 125 



(b) Leaflets 3-5, lobed or 

 doubly serrate, fruit 



winged Aceraceae 134 



(c) Leaflets 5-11, sharply ser- 

 rate, fruit clusters of 



drupes Sambucus . . .157 



