DOUBLE BLADDERPOD 



Physaria didymocarpa (Hooker) Gray 



FRUIT OF PLATE 1 67 



The hot sun of the long 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 generic name Physaria is derived from a Greek word signifying 

 bellows, in allusion to the form of the fruits. About six species of 

 Physaria are known, all of them natives of western North America. 



Double bladderpod ranges from Colorado to Utah and northward 

 to Saskatchewan and Alberta. 



The specimen sketched grew near Ptarmigan Pass, ten miles north 

 of Lake Louise, Alberta, Canada, at an altitude of 6,500 feet. 



PLATE 168 



