ORCHIDS 145 



their adhesive glands by a kind of hinge, which 

 allows or compels them, as soon as out of their 

 pockets to bend downward and forward, so as to 

 strike with certainty the stigma of the next flower. 



TALL WHITE BOG ORCHIS Habenaria dilatata. 

 May- A ugust 



A strictly northern orchid, being found in Maine, 

 the White and Green Mountains, and even braving 

 the rigours of the Iceland climate. It is pure white 

 in colour, and has the peculiarity that the pollen 

 glands are shaped like the sole of a shoe, and also, 

 when the pollen clubs are removed from their sacs, 

 they do not bend downward, because they are al- 

 ready in a position upon the insect such as con- 

 veniently to touch the next stigma. 



TALL LEAFY GREEN ORCHIS Habenaria hyperborea 

 June-August 



While this is similar in most respects to the fore- 

 going orchids, it has this peculiarity: The pollen 

 masses are so loosely contained in the anther sacs 

 that they often fall out in the bud and are found, 

 when the flowers open, to have rolled about loosely 

 and to lie against the stigma. 



Thus, as a rare exception, this orchid may be self- 



