The Trees of Texas 125 
flowered racemes, or solitary. Fruit a narrow lnear, smooth 
pod constricted between the seeds. 
Near San 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, ieaves 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 Junvo Family. 
Koeberlinia Zuccarini. 
1. Koeberlinia spinosa Zuccarini. A smali, 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 
