116 Bulletin of the University of Texas 



4. ACACIA (Tournefort) Adamson. The Acacias. 



Thorny trees with alternate evenly bipinnate leaves, nu- 

 merous pinnae and numerous leaflets. Flowers in globose 

 heads, or cylindrical racemes. Fruit an elongated, flat or 

 cylindrical pod. 



Flowers in elongated spikes or racemes. 



Pods only slightly curved 1. A. Wrightli. 



Pods much curled and contorted 2. A. Greggli. 



Flowers in globular heads 3. A. Subtortuosa. 



1. Acacia Wrightii Bentham. Cat's Claw. A small wide 

 topped tree, sometimes 25 high, with furrowed bark; striated, 

 angular branchlets, and short curved spines. Leaves evenly 

 bipinnate with 2-6 pinnae; leaflets 6-12, sessil, firm, light 

 green, hairy, with prominent veins. Flowers borne in racemes 

 in the axils of the leaves, yellowish, fragrant. Fruit a flat- 

 tened, almost straight pod constricted between the seeds. 

 "Western Texas to Mexico. 



The wood is close grained, hard, used for fuel. 



2. Acacia Greggii A. Gray. Paradise Flower. Devil's 

 Claw. A small, thorny tree 20-30 high with stout reddish 

 brown zigzag branchlets and hairy twigs. Le-aves evenly 

 bipinnate, pinnae 2-6, leaflets 8-14, thick, firm, light green. 

 Fruit a very much contorted flattened pod constricted between 

 the seeds. In the ravines from the valley of the San Saba 

 River to the Devil's River -and south to Mexico. 



3. Acacia subtortuosa Shafer. Rio Grande Acacia. A 

 small round topped tree 18-20 high or a shrub, with dark 

 brown fissured bark, zigzag branches, hairy twigs and light 

 gray spines. Leaves evenly bipinnate, pinnae 6-8, leaflets 9-14 

 pairs. Flowers in globose heads, in axillary clusters of 1-3, 

 fragrant, bright yellow. Fruit a straight slightly flattened 

 pod, somewhat constricted between the seeds. Along the Rio 

 Grande River, southwestern Texas and adjacent Mexico. 



5. HARVARDI Small. Huajillo. 



1. Havardia brevifolia (Benth). Small. A small, evergreen 

 tree with erect branches, thin gray bark and short curved 



