124 SILVA OF NORTH AMERICA. LEGUMINOS2. 
sapwood composed of six or seven layers of annual growth being clear yellow. The specific gravity 
of the absolutely dry wood is 0.9392, a cubic foot weighing 58.53 pounds. It furnishes excellent fuel, 
and is used in large quantities for that purpose in all the territory adjacent to the lower Rio Grande. 
Acacia Wrightii was discovered in the neighborhood of Matamoras by Jean Louis Berlandier in 
1830. Its specific name commemorates the late Charles Wright,’ who, several years later, found it in 
western T'exas. 
1 See i. 94. 
EXPLANATION OF THE PLATE. 
Puate CXLII. Acacia WRrIGHTII. 
. A flowering branch, natural size. 
Diagram of a flower. 
A flower, enlarged. 
Portion of a stamen, enlarged. 
. A pistil, enlarged. 
. Vertical section of an ovary, enlarged. 
. An ovule, much magnified. 
. A fruiting branch, natural size. 
OW ONAD oP & bd 
. A portion of a legume, one of the valves removed, natural size. 
ba 
—) 
. Vertical section of a seed, enlarged. 
= 
= 
. An embryo, enlarged. 
