136 SILVA OF NORTH AMERICA. 
the Acacia, the Parkinsonia, and the Cercidium, forms a characteristic feature of the arborescent vege- 
tation. 
The foliage is eaten by sheep and goats in winter.’ 
Pithecolobium brevifolium was discovered by Jean Louis Berlandier near the mouth of the Rio 
Grande in 18380.’ 
1 Havard, Proc. U. S. Nat. Mus. viii. 500. 
and sound enough to determine satisfactorily its specific gravity 
2 The wood of Pithecolobium brevifolium is dark-colored, heavy, and fuel value. 
and rather hard, but I have not been able to obtain a piece large 
EXPLANATION OF THE PLATE. 
PuatTeE CXLVI. PITHECOLOBIUM BREVIFOLIUM. 
i 
. A flower, enlarged. 
DAHA P Wr 
A flowering branch, natural size. 
. Vertical section of a flower, enlarged. 
. A pistil, enlarged. 
. A fruiting branch, natural size. 
A seed, enlarged. 
. Vertical section of a seed, enlarged. 
. An embryo, enlarged. 
LEGUMINOS. 
