WAYSIDE WEEDS. "59 



for other insects, doubtless, are equally useful : and 

 there exist well-authenticated instances of pollen 

 thus being carried many miles to its destined use. 



Remember, however, that the pollen of a rose 

 wiU not fertilize a wallflower, nor that of a hem- 

 lock a poppy ; like must to like, and that it will 

 to like renders it needful for the seed-grower and 

 nurseryman to be very careful in Ms way. Allied 

 plants, such as cabbage, cauliflower, broccoli, etc., 

 do intermingle in their fertilization, and, as a 

 consequence, a choice variety may be deteriorated 

 or lost by the flowering of other varieties of the 

 same family in its immediate neighbourhood. How* 

 ever, this is digression. To go back to the stigma 

 and its varied forms ; we have already alluded to 

 the four-cleft organ of the willow herb, now look 

 at the harebell or campanula, and it is three-cleft ; 

 find it out in the grasses, and it is an elegant 

 feather ; in the primrose, a Kttle knob like a pin's 

 head. 



We have already remarked that the organs of 

 the flower were essential and non-essential with 

 reference to the production of Seed, the essential 

 being the stamen and pistil. Nevertheless, the 

 botanist regards that blossom only as the type of 

 a perfect flower which possesses calyx and corolla, 

 stamens and pistils fully developed j a lychnis 

 wanting in one blossom the pistil, in another the 

 stamens, or the anemones with a petaloid calyx 



