31 



The stigma is not always distinctly lobed, but sonietimes 

 there are five small, rounded projections upon it (Fig. 21 Я, /) 

 covered by a thick mucilage which it secretes. 



The plant is homogamous (Warming. Lindman, Ekstam). The 

 pores of the anthers are open even in the bud, and the pollen 

 grains (tetrads. Fig. 21 F) lie loose in the pollen-sacs; however, 

 I have not found the pollen shed until the corolla is open and 

 the anthers have become dry. Even in the bud the stigma 

 may be seen to be shiny and very viscid. Self-pollination may 



Fig. 21. Andromeda polifolia. (From Denmark; May 18.) 



-■1, Diagram of the outer leaves of the flower and of the bracteoles. B, Apex of a flow eriajf 

 branch with the two loivest foliage-leaves which protect small vegetative buds; al)ove 

 them a foliage-leaf, which has been removed, protected the most vigorous of the vegetative 

 buds; above this two bracts are seen, one protecting a flower that has not expanded (/), 

 and another protecting an expanding flower; some closely-set scale-leaves terminate the 

 branch. C, Longitudinal section through a fully expanded flower. O, A flo\ver seen from 

 above. И, Anther. F, Pollen tetrads. G, Ovary with the nectary and two stamens. H. I, 

 Apex of the style, and stigma. (E. W., 1886.) 



easily take place in the recently expanded flower, because its 

 stigma is situated immediately below the anthers and it almost 

 closes the throat, which is only from 1-25 to 1*5 mm. wide 

 (Fig. 21 />). The hairs on the corolla may " serve temporarily 

 to retain the shed pollen-grains In Finmark I found masses 

 of pollen-grains adhering to the hairs in the throat (July 3, 1885). 



