28 SILVA OF NORTH AMERICA. ANACARDIACEZ. 
tree-hke habit, probably attaining its greatest size on the shores of Todos Santos Bay in Lower 
California. 
The wood of Rhus integrifolia is hard and heavy, with bands of open ducts distinctly marking the 
layers of annual growth, and many thin conspicuous medullary rays. It is of a handsome bright clear 
red color, with thin pale sapwood composed of eight or ten layers of annual growth. The specific 
gravity of the absolutely dry wood is 0.7830, a cubic foot weighing 48.80 pounds.’ It possesses a 
high fuel value, and is cut and consumed in large quantities in the regions where it abounds. 
The berries, from which a white oily acid substance exudes, are occasionally used in southern 
California in the preparation of a cooling beverage,’ either fresh or after having been roasted and 
ground. 
Rhus integrifolia was discovered by Thomas Nuttall* in 1835 in the neighborhood of San Diego. 
once abundant on the island, as shown by the remnants of dead spreading out horizontally and not more than a foot above the 
trees which have furnished fuel to the parties of seal hunters and surface of the ground (Pittonia, i. 78). 
fishermen who for years have frequented the island. One of these 1 Garden and Forest, iii. 332. 
skeleton trees had produced gnarled branches thirty feet in length, 2 C. R. Orcutt, The Western American Scientist, iii. 46. 
8 See ii. 34. 
EXPLANATION OF THE PLATE. 
Puate CIX. Ruuvs INTEGRIFOLIA. 
. A flowering branch of the staminate tree, natural size. 
. A flowering branch of the pistillate tree, natural size. 
A staminate flower, enlarged. 
Vertical section of a staminate flower, enlarged. 
. A pistillate flower, enlarged. 
Vertical section of a pistillate flower, enlarged. 
. A fruiting branch, natural size. 
. Vertical section of a fruit, enlarged. 
COND TP WD 
. An embryo, much magnified. 
