338 HANNIBAL: A PLIOCENE FLORA FROM CALIFORNIA 
istic of this species. This is due doubtless to state of preservation, 
since it is more or less true of the other serrate species as well. 
Best developed in the more humid portions of the chaparral 
belt, but extends into more arid portions on the one hand and into 
the redwood and yellow pine belts on the other. Northern British 
Columbia east to the Rockies and south to northern Lower Cali- 
fornia. 
FABACEAE 
Psoralea physodes Douglas. Chaparral psoralea. 
Several imperfect specimens of the broad-leaved form were 
secured. 
Characteristic of the more humid portions of the chaparral 
belt. Humboldt to Los Angeles counties, California. 
RHAMNACEAE 
Rhamnus Purshiana De Candolle. (PLATE 15, FIG.10.) Cascara 
sagrada. 
The material at hand shows no tendency to intergrade with 
the following species though the latter is regarded by some as a 
subspecies of R. Purshiana. 
Cafions and river bottoms of the fog belt. Puget Sound region 
and Idaho south to Mendocino County, California. 
Rhamnus californica Eschscholtz. (PLATE 15, FIG. 7.) California 
coffeeberry. . 
Occurs chiefly in the intermediate zone between the fog belt 
and chaparral belt, frequently on open hillsides, but extending into 
the chaparral with Arbutus. Humboldt County, California, to 
northern Lower California. 
CORNACEAE 
Cornus glabrata Bentham. (PLATE 15, FIG. 4.) Bentham’s dog- 
wood. 
Most of the Calabazas Cafion material shows a pair of strong 
lateral veins near the base of the leaf. The character is more 
pronounced than in most of the herbarium material examined. 
The specimen figured retains traces of the original leaf structure. 
Foothill streams in rather moist situations. Humboldt County 
south to Monterey County, California. 
