1894- ON THE DISPERSAL OF THE NUTLETS. 289 



margins ; the other teeth are ovate ; the two lateral ones very shortly 

 pointed, the two anterior ones more pointed. The mouth is open, 

 but a ring of hairs closes the throat. 



In consequence of wet the pedicel bends up so that the calyx 

 becomes horizontal ; the two anterior teeth bend slightly down, and 

 the two lateral teeth move a little apart, so that the opening of the 

 mouth is slightly enlarged. The movements of the teeth can only 

 be seen under the microscope. 



Habitat : Central America. 



2. Melissa officinalis (Linn.). 



The stem is erect; the flowers are in lax, few-flowered axillary 

 verticillasters. The calyx is pedicellate, two-lipped, slightly inflated, 

 the mouth open. The upper lip is spreading, truncate, shortly three- 

 toothed ; the lower lip is bifid, the two pointed teeth either pressed 

 against each other or crossing each other. The throat is lined with a 

 ring of hairs, which closes the mouth. The whole calyx is rather 

 deflexed. 



In consequence of wet the pedicels straighten, so that the calyces 

 are raised to a nearly horizontal position. The anterior teeth are 

 also lowered very slightly. 



Habitat : S. Europe and M. Asia — woody hills. 



3. Salvia sclarea (Linn.). 



The flowers are arranged in six-flowered verticillasters. The 

 calyx is shortly pedicellate, hairy, slightly bent downwards. The 

 upper lip is tridentate, the lower bifid with acuminate teeth. In 

 consequence of wet, the pedicels bend slightly up, so that the calyx is 

 raised, and at the same time the teeth of the lower lip are very 

 slightly lowered. 



Habitat : S. Europe, — roads and dry places. 



4. Salvia gigantea (virgata, ait. hort. kew.), Figs. 20-22. 



The flowers are arranged in six-flowered verticillasters. The 

 calyx is shortly pedicellate, campanulate, hairy. The teeth of the 

 lower lip bend up so as nearly to close the mouth. The movement in 

 consequence of wet is the same as in Salvia sclarea, but the down- 

 ward movement of the lower lip is more marked. 



Habitat: Italy. 



III. — The movement is confined to the calyx-teeth. 



Lamium Jlexiiosum (Ten. fl. nap.), Figs. 23, 4. 



The stem is erect ; the flowers are in dense axillary verticillasters. 

 The calyx is bent downwards below the horizontal, subcampanulate, 

 lined with short hairs. The mouth is partially closed by the teeth, 

 the posterior tooth bending down forwards, and the two lateral ones 

 bending across, so as to meet. 



In consequence of wet the posterior tooth bends up until it is 

 horizontal, and the lateral teeth bend out sideways, so that the nuts 

 can be shaken out more easily. 



Habitat : Liguria. 



