Leguminosae. 87 
and A. dealbata with which the Blackwood is usually planted on the 
drier slopes of our mountains. It is called the Blackwood on account 
of the dark color of the heartwood. The specific name melanoxylon 
is from the Greek and means Black-wood. 
It is a native of Tasmania and Australia, and is considered one 
of the most valuable timber trees of that country. 
Prosopis juliflora (Sw.) DC. 
Kiawe, Algarroba, Algaroba. 
Plate XXXVI. 
The Algaroba is by far the most common as well as the most 
valuable of all the introduced trees in the Hawaiian Islands. No 
tree so far introduced has proved of such enormous benefit to these 
Islands as the Algaroba. Nevertheless the exact identity of this valu- 
able tree has as yet not been definitely determined. It seems to be 
a very variable species, not only in these Islands, where specimens 
occur bristling with spines and then again others without a thorn, 
but also in its native home, which by the way, seems to include the 
West Indies, the southern United States, Central America, and even 
portions of South America, as for example, Brazil and Peru. In the 
"Flora Brasiliensis" of Martius, a monumental work, Prosopis dulcis 
is looked upon as a synonym of Prosopis juliflora', and is recorded 
from Brazil as a large tree. 
It has been stated to be also identical with a species occurring in 
Texas and New Mexico, which has, however, been recorded lately 
by E. O. Wooton and P. C. Stanley in their "Flora of New Mexico" 
(1915, Contrib. U. S. Nat. Herb. V. 19), as Prosopis glandulosa 
Torr. (the Mesquite). Its range is given as Arizona and New 
Mexico to Oklahoma and Texas. The legume is described as inde- 
hiscent, slightly compressed, straight or falcate. The height of the 
plant is given as 3 meters (about 12 feet). 
In order to avoid confusion, the writer adhers to the name 
Prosopis juliflora for the tree found in Hawaii, which in all prob- 
ability is identical with the plant known by that name elsewhere, as 
for example, in Brazil. All the waste lands in these Islands, which 
previous to the introduction of this valuable tree were absolutely 
barren, are now covered with green forests made up exclusively 
of this tree. It grows exceptionally well on the lee sides, and for 
miles there exist now almost impenetrable jungles, which not only 
supply excellent firewood, but furnish flowers with the best of nectar 
