The Trees of Texas 



flowered racemes, or solitary. Fruit a narrow linear, smooth 

 pod constricted between the seeds. 

 Near S~an Diego, Texas. 



ZYGOPHYLLACEAE Lindley. The Caltrop Family. 



Porleira Ruiz and Pavon. 



1. Porleira augustifolia (Engelman) A. Gray. A' small 

 straggling tree or shrub with smooth branches, leaves oppo- 

 site, evenly pinnate, leaflets 4 to 6 pairs. Flowers purple, 

 borne on short branches. Fruit a 2-lobed or 4-lobed capsule. 



On plains and prairies of western Texas and Mexico. 



KOEBERLINIACEAE Engler. The Junco Family. 



Koeberlinia Zuccarini. 



1. Koeberlinia spinosa Zuccarini. A small, low, round 

 topped, thorny tree with reddish brown bark and light green 

 twigs. Leaves alternate, scale-like, soon deciduous. Flowers 

 small, perfect in short racemes at the ends of branchlets. Fruit 

 a globose black berry with thin flesh and one to several seeds. 

 RUTACEAE Juss. Rue Family. 



Aromatic trees or shrubs with simple or pinnate leaves 

 borne alternate to opposite, mostly regular, perfect flowers 

 in compound clusters. Fruit a capsule, berry samara or drupe. 



Fruit a dehiscent capsule, 1 to 2 seeded 1. Fagara. 



Fruit an indehiscent samara. 



Samara 3 to 4 winged, leaves evergreen 2. Helietta. 



Samara with one wing surrounding the seed.. 3. Ptelea. 



FAGARA L. Prickly Ash. 



Trees with alternate unequally pinnate leaves, small, white,, 

 polygamous flowers in terminal or axillary clusters, and corky 

 ridged bark. 



Flowers terminal, leaves deciduous 1. F. Clava-Herculis. 



Flowers axillary, leaves evergreen 2. F. Fagara. 



1. Fagara Clava-Herculis (L.) Small. Prickly Ash. Tooth- 

 ache Tree. A small round topped tree 25-30 high with 



