v.J LABIATE. 15I 



In P. palustris the point m is elongated, and the 

 anthers, in the specimens which I have examined, are 

 glabrous. 



The structure of Melampyrum agrees in essentials 

 with that of Pedicularis. In Calceolaria pinnata, 

 Hildebrand describes an arrangement somewhat 

 similar to that which we shall meet with in Salvia. 



LABIATE. 



This large and interesting order contains eighteen 

 British genera, amongst which are the Salvia, Dead 

 Nettle, Sage, Thyme, Mint, Marjoram, Bugle, and 

 Calamint. Most of them, if not all, produce honey 

 at the base of the ovary. 



In few flowers is the adaptation of the various 

 parts to the visits of insects more clearly and beauti- 

 fully shown than in the common white Dead Nettle 

 (Lamium album), (Fig. 109). 



The honey occupies the lower contracted portion 

 of the tube, and is protected from the rain by the 

 arched upper lip and by a rim of hairs. Above the 

 narrower lower portion the tube expands, and throws 

 out a broad lip (Fig. in m), which serves as an 

 alighting place for large bees, while the length of 

 the narrow tube prevents the smaller species from 

 obtaining access to the honey, which would be in- 

 jurious to the flower, as it would remove the source 

 of attraction for the bees, without effecting the object 

 in view. At the base of the tube, moreover, at the 

 point marked ca, Fig. ill, there is a ring of hairs 



