1908] Grinnell—Biota of the San Bernardino Mountains. 41 
Prunus fasciculata (Torrey) Gray. 
The desert almond was abundant at Cactus Flat, 6000 feet, 
and farther down towards the desert base of the mountains. It 
was taken in fruit August 17, 1905. 
Prosopis juliflora (Swartz) De Candolle. 
The mesquite occurred in isolated bushes quite commonly on 
the desert washes about Cushenbury springs; but no extensive 
thickets were seen. 
Amorpha californica Nuttall. 
An abundant bush in the black oak belt (Lower Transition) 
south of the Santa Ana, from the head of Mountain Home creek 
to Fish ereek. I saw less thrifty looking shrubs down into the 
serub oak belt. It bloomed in the latter part of July. 
Lupinus albifrons Bentham. 
Abundant in the Upper Sonoran and lower Transition zones 
all along the upper Santa Ana, especially among the sage-brush; 
blooming in June and early July. 
Oxytropis oreophila Gray. 
A dwarf loco weed taken on the summit of San Gorgonio 
peak, 11,450 feet, July 16, 1906, is thus determined by Miss East- 
wood. It was common on the gravel between the granite blocks. 
Linum Lewisii Pursh. 
This flax was abundant among the pines of the lower Tran- 
sition zone in the region of the upper Santa Ana, flowering early 
in June. 
Rhus trilobata Nuttall. 
Very abundant in parts of the Upper Sonoran brush belt. 
Its vermillion-hued fruits were so profuse in August on the north 
wall of the upper Santa Ana, 5500 feet altitude, as to render the 
clumps of this plant discernible for at least a mile. 
