WHITE DRYAD 



Dry as octopetala Linnaeus 



FRUIT OF PLATE I76 



The flowers of white dryad are quickly withered by the hot sun 

 of midsummer, their stems lengthen, and the twisted fruit head ap- 

 pears, later spreading into a ball of "seeds". These are each provided 

 with a silky tail, which enables the wind to carry the seeds to distant 

 places. At a certain stage, before the heads are fully ripe, the ponies 

 are fond of them. At this time the plants often give a misty pink color 

 to the areas they occupy. 



White dryad occurs on limestone soils from Labrador and Green- 

 land throughout Arctic America, in the Rocky Mountains from Utah 

 and Colorado to British Columbia, and in Europe and Asia. 



The specimen sketched was obtained in the valley of the Siffleur 

 River, fifty miles by trail north of Lake Louise, Alberta, Canada, at an 

 altitude of 6,500 feet. 



PLATE I77 



