114 Bulletin of the Unversity of Texas 
North Carolina to Florida and Texas. Planted throughout 
its range as an ornamental tree. 
MIMOSACEAE. The Mimosa Family. 
Trees with alternate compound evenly pinnate leaves and 
small leaflets. Fruit a bean-lke pod. 
Leaves with 1 to 2 pairs of pinnae. 
Leaflets 5 to 8 pairs, pods tightly twisted........ 1. PLLOMmpOear Da. 
Leaflets 12-20 pairs, pods not twisted........... = SEE 
Leaves 2 to 3 pairs of pinnae, leaflets numerous... 3. es 
Leaves with 1 to 4, 2 to 3 or 3 to 4 pairs of pinnae. 4. Acacia. 
Leaves with: 3-to-). pairs or —innNae ee ee ee ee 5. Havardia. 
Leaves ‘with 's to-8 pairs of pimnae: <” soce-. ee eae 6. Vachellia. 
Leaves with 2-to°20. paiss of pinnae.t°. J). 2... 7. Leucaena. 
1. STROMBOCARPA. Screw Bean. 
1, Strombocarpa odorato (Torrey) A. Gray. Screw Bean. 
A shrub or small tree with thick, shaggy, light brown bark, 
and reddish brown branches which are armed with axillary 
spines. Leaves bipinnate mostly with 1 pair of pinnae, some- 
times 2 pairs. Flowers in slender, stalked, axillary spikes. 
Fruit a twisted cylindrical pod. 
2. PROSOPIS. The Mesquites. 
1. Prosopis glandulosa Torrey. Mesquite. A low, round 
topped tree with thick, reddish brown, fissured bark, yellow- 
ish green twigs and darker branches which are frequently 
armed with axillary spines. The leaves are bipinnate with 1 
to 2 pairs of pinnae; leaflets numerous. Flowers perfect, 
borne in slender, green or yellowish spikes. Fruit a straight 
or slightly curved indehiscent pod. 
Mexico north to Nevada, Kansas, Texas and California. It 
has gradually encroached on the grassy plains and frequently 
forms dense shrubbery thickets. 
The wood is heavy, very hard, close grained, dark red in 
color, very resistant in contact with the soil, takes a beauti- 
ful finish. It is used for furniture, ornaments, gun stocks, grill 
work, posts and fuel. The beans are used for food. 
