DOUBLE BLADDERPOD 
Physaria didymocarpa (Hooker) Gray 
FRUIT OF PLATE 167 
. Thehotsunofthelong June days of northern latitudes soon develops 
the seed vessels of the double bladderpod, and the reason for the com- 
mon name is then disclosed. When decorated with the many inflated 
seed pods the plant is unique in appearance and more conspicuous 
than when in bloom. 
The genetic name Physaria is derived from a Greek word signifying 
bellows, in allusion to the form of the fruits. About six species of 
Physavia are known, all of them natives of western North A metica. 
Double bladderpod ranges from Colorado to Utah and northward 
to Saskatchewan and A betta. 3 
The specimen sketched grew near Ptarmigan Pass, ten miles north 
of Lake Louise, Alberta, Canada, at an altitude of 6, 500 feet. 
PLATE 168 
