338 



BRITISH FLOWERING PLANTS 



the stamens and pistils. In S. officinalis, however, the 

 back of the upper hp shows an arch at the part x, and 

 the front portion of the lip, containing the stamens, is 

 loftier than in Lamium, and does not therefore come in 

 contact with the back of the bee (Fig. 222). This is 

 evidently correlated with the difference in the stamens 



Fig. 221. 



Fig. 222. 



Fig. 223. Fig. 224. Fig. 225. 



■ Fig. 221-225. — Salvia officinalis. Fig. 221, section of a young flower; Fig. 222, 

 flower visited by a bee ; Fig. 223, older flower ; Fig. 224, stamens in their 

 natural position ; Fig. 225, stamens when moved by a bee. All enlarged. 

 a, sterile, «', fertile half of anther ; /, filament of functional stamen ; /', 

 position of aborted stamen ; m, connective ; p, pistil ; st, stigmas ; iC, arch of 

 corolla. 



(Fig. 221), two of which (/') are minute and rudi- 

 mentary, while in the other pair the two anther cells 

 (a a') are separated by a long connective. Moreover, 

 the lower anther cells (a a) contain very little pollen ; 

 sometimes, indeed, none at all. This portion of the 

 stamen, as shown in Fig. 223, hangs down and 

 partially stops up the mouth of the corolla-tube. 



