The Trees of Texas 117 



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spines. Leaves evenly bipinnate, pinnae 2-5 pairs, each with 

 10-20 pairs of sessile light green leaflets. Flowers in head- 

 like '.-lusters. Fruit a flattened, pointed, dehiscent pod. Along 

 the -Rio Grande River and Northern Mexico. 



The wood is hard, dark reddish brawn and very heavy. 



6. VACHELLIA Wright and Arnott. Huisache. 



1. Vachellia Farnesia (Linnaeus) Arnott and Wright. A 

 small, round-topped, thorny tree 20-30 high, with drooping 

 branches and thin bark which peels off in long, reddish brown 

 scales. Leaves evenly bipinnate, pinnae 3-8 pairs, leaflets 

 20 to 50, light green and smooth on both sides. Flowers yel- 

 low in globular he-ads, very fragant. Fruit a cylindrical, 

 straight or slightly curved, dark brown or purplish pod con- 

 stricted between the seeds. 



On the plains and prairies of Southern Texas and South 

 to Mexico. Extensively cultivated throughout the tropics. 



7, LEUCAENA Benth. Lead Trees. Trees or shrubs with 

 evenly bipinnate persistent leaves, slender branches without 

 thorns, flowers in globose heads, and dehiscent, linear, flat- 

 tened pods. 



Pinnae 10 to 20 pairs, twigs wooly 1. L. pulverulenta. 



Pinnae 2 to 10 pairs, twigs smooth. 



Leaflets 10-20 pairs 2. L. glauca. 



Leaflets 16-30 pairs 3. L. Greggii. 



1. Leucaena pulvemlenta (Schlechtendal) Bentham. Mex- 

 ican Lead Tree. A medium sized, round topped tree 40-50 

 high with straight trunk, spreading branches and thick light 

 brown scaly bark. Leaves evenly bipinnate, pinnae 10-20 

 pairs; leaflets 15-30 pairs, small, light green, smooth. Flowers 

 in dense globose heads in the axils of the leaves. Fruit a 

 brown, shining, linear flattened pod. 



Along the Rio Grande River, Texas, and Mexico. 



2. Leucaena glauca (Linnaeus) Bentham. Lead Tree. A 

 shrub or small tree with spreading branches, thin, dark brown 

 bark and hairy twigs. Leaves evenly bipinnate, pinnae 3-10 

 pairs, leaflets 20-40, light green, paler beneath. Flowers in 



