DOUBLE BLADDERPOD 



Physaria didymocarfa (Hooker) Gray 



The double bkdderpod is a curious plant of unusual appearance. It 

 thrives best in dry limestone soils on steep mountain sides, or in the 

 deposits of glacial streams. The many pale blue-green leaves form a 

 rosette upon the surface of the soil, from which spring the delicate 

 gray stems bearing four-petaled yellow flowers. The root is long, thick, 

 woody, and tough. In its aspect the plant suggests an alpine species. 

 It belongs to the Mustard Family. 



Double bkdderpod ranges from Colorado to Utah and northward 

 to Saskatchewan and Alberta. 



The specimen sketched grew near Lake Minnewonka, seven miles 

 from Banff, Alberta, Canada, at an altitude of 4,500 feet. 



PLATE 167 



