31 
The stigma is not always distinctly lobed, but sometimes 
there are five small, rounded projections upon it (Fig. 21 H, I) 
covered by a thick mucilage which it secretes. 
The plant is homogamous (WarminG, Linnman, Exstam). The 
pores of the anthers are open even in the bud, and the pollen 
grains (tetrads, Fig. 21 /’) 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.) 
A, Diagram of the outer leaves of the flower and of the bracteoles. B, Apex of a flowering 
branch with the two lowest foliage-leaves which protect småll vegetative buds; above 
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 (7), 
and another protecting an expanding flower; some closely-set scale-leaves terminate the 
branch. C, Longitudinal section through a fully expanded flower. D, A flower seen from 
above. £, 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 D). 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). 
