374 FOREST CULTURE AND 
ern parts of the La Plata States. A thorny shrub, 
growing finally to a tree, adapted for live-fences. This 
is one of the species yielding the sweetish Algaroba- 
pods for cattle-fodder, and utilized even in some in- 
stances for human food. As allied plants, beside the 
following, may be mentioned: P. horrida, Humb., 
occurring from the base of the Andes to the sand-shores 
of Peru; P. juliflora, Cand., growing from Mexico 
and West India to Ecuador ; P. Siliquastrum, Cand. , 
extending from the Chilean Andes apparently into the 
Argentine Province Catamarka. <A short communi- 
cation on the American Algaroba-trees was presented 
to our Parliament by the writer, in 1871. 
Prosopis glandulosa, Torrey.—Colorado, Arkansas, 
Texas. The pods of this thorny evergreen shrub or 
tree are also succulent. It exudes a gum, not unlike 
Gum Arabic, and this is obtained so copiously that 
children could earn from two dollars to three dollars 
a day in Texas while gathering it —latterly about 
40,000 lbs. being bought by druggists there. The 
tree attains a height of 30 feet, and its wood is exces- 
sively hard. The pods of several species are rich in 
tannin. 
Prosopis pubescens, Bentham.—Texas, California, 
New Mexico. Likely available for hedges, with other 
species of other countries. 
Prosopis spicifera, L.—India. <A thorny tree, also 
with edible pods; possibly hardy here. 
Prosopis Stephaniana, Kunth. — Syria and Persia. 
A shrubby species for hedge-growth. 
Prunus Americana, Marshall. (P. nigra, Aiton.)— 
Canada, Eastern United States of America. A thorny 
tree, furnishing the yellow and red plum of North 
