9 



ö, Я), consequently, the pollen-grains (Fig. 2 C) might be shed 

 at that time, but we can scarcely think that this occurs until 

 the flowers open and the anthers us well as the pollen-grains 

 are dry. 



[n the full-blown, expanded flower, the stamens are widely 

 spreading (Fig. 2 ^; /), and the stigma is ripe (glistening). The 

 latter consists of five small protuberances seated upon the apex 

 of the style which is flat and has a sharp edge (Fig. 2 D\. 



Self-pollination appears rather difficult unless the wind 

 transfers the pollen to the stigma; in 

 this connection an important feature 

 to note is undoubtedly that the 

 inflorescence comprises so many 

 flowers, and that they occur so 

 closely together that geitonogamy may 

 take place. 



Cross-pollination by insects may 

 easily take place, and many kinds of 

 insects are doubtless able to obtain 

 the honey which is secreted abundantly 

 and in large drops at the ten-lobed 

 base of the ovary (Fig. 2 -E), and is 

 retained by the hairs which occur upon 

 the basal parts of the stamens. In 

 Greenland Ledum palustre var. decum- 

 bens is visited by Argynnis chariclea 

 Herbst; but in a garden near Copenhagen I have seen dead or 

 dying individuals of three kinds of flies (most frequently Empis 

 chioptera Fall., then Bhamphomyia hybrida Zett., and a species 

 of Microphorus {velutinus?) adhering to it by their wings and 

 legs; the cause of death is unknown ; the strong perfume appears to 

 stupefy them. Poppids observed a number of insect-visitors (I.e.). 



The ovary is covered with two kinds of hairs, viz. small, 

 shiny, pearl-like glandular hairs, and setaceous hairs (Fig. 2). 



Fig. 3. Ledum palustre. 

 (From West Greenland.) 



Ripe capsule in natural position. 



