9 6 



PART I.— ORGANOGRAPHY. 



with the corolla tube laid open to show the relative arrangement. 

 It will be seen that a bee visiting one of the short-styled flowers 

 will have her head dusted by pollen from the long stamens as she 

 reaches to the bottom of the cup for the nectar, and that in passing 

 to one of the long-styled flowers she will bring the same parts in 

 contact with the stigmas, and therefore probably deposit pollen 

 upon them. At the same time, also, her proboscis is brought in 

 contact with the short stamens in the tube, and its middle por- 

 tion dusted with the adhesive pollen. If now again she visits a 

 short-styled flower, some of this pollen will in all probability be 

 left upon the stigma. 



Fig. 2S9. 



Fig. 290. 



Fig. 289. — Flower of the common Sage, in the staminate stage, visited by a bee. The 

 fertile anther lobes are seen in contact with the insect's body, while the stigma is well out 

 of the way, barely projecting from the upper lip of the corolla. 



Fig. 290. — Flower of the Sage in the pistillate stage, when the stamens have withered 

 and the style lengthened, so as to occupy a position similar to that of the fertile anther 

 lobes in the previous ngure. 



In some other cases, as in Lythrum salicaria, there are flowers 

 of three different kinds, long-styled, mid-styled, and short-styled 

 ones, which constitute a very effective means of cross-fertiliza- 

 tion by insect agency. Such flowers are called trimorphous. 



(5) By special contrivances. Many of these are exceedingly 

 elaborate and wonderful. The flower of the common Sage is an 

 illustration of one of them. The flowers are proterandrous, and 

 are pollinated by bees. Fig. 289 represents one in the staminate 

 stage visited by a bee ; the stigma is out of the way, nearly 

 concealed under the arching upper lip of the corolla, while the 

 anther-lobes are in contact with the back part of the insect's 

 body as she sips the nectar. Fig. 290 represents a flower of the 



