The Trees of Texas 117 
spines. Leaves evenly bipinnate, pinnae 2-5 pairs, cach with 
10-20 pairs of sessile hgeht green leaflets. Flowers in head- 
like clusters. Fruit a flattened, pointed, dehiscent pod. Along 
the Rio Grande River and Northern Mexico. 
The wood is hard, dark reddish brown and very heavy. 
6. VACHELLIA Wright and Arnott. Huisache. 
1. Vachellia Farnesia (Linnaeus) Arnott and Wright. A 
small, round-topped, thorny tree 20°-380° 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 heads, 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, lnear, flat- 
tened pods. 
Eanene 10 to 20 pairs, TLWiZS -WoOOly../..... 2.0.25 00s% 1. L. pulverulenta. 
Pinnae 2 to 10 pairs, twigs smooth. 
eee TO Pn ASE E Se aoc ne ace Sah gcc dace eo 2. i, SIUC. 
ree eine ee el ASE 8 ok ss Sole Sa aiievs O's He 3. L. Greggii. 
1. Leucaena pulverulenta (Schlechtendal) Bentham. Mex- 
ican l.ead 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 Ric Grande River, Texas, and Mexico. 
2. Leucaena glauca (Linnaeus) Bentham. Lead Tree. A 
shrub cr 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 
