LABI A T&. 



275 



Topic IX: Dicotyledons with united petals, flower 

 parts in four whorls. 



ORDER TUBIFLOR^:. 



437. Lesson XVII. The mint family (labiatae). The mint 

 family contains a large number of genera and takes its common 

 name from the mints, of which there are several species belong- 

 ing to the genus mentha. In the figure of the " dead-nettle " 



Fig. 235. 



Whortleberry (Gaylussacia re- 

 si nosa). 



ig. 236. 



Spray of dead-nettle (Laminum am- 

 plexicaule), leaves and flowers. 



(Lamium amplexicaule), which is also one of the members of 

 this family, we see that the lobes of the irregular corolla are 

 arranged in such a manner as to suggest two lips, an upper and 

 a lower one. From this character of the corolla, \vhich obtains 

 in nearly all the members, the family receives its name of 

 Labiatte. The calyx is iive-lobed. The stamens, four in 

 number, arise from the tube of the corolla, and converge in 



