CHAPTER LXV. 



DICOTYLEDONS CONCLUDED. 



Topic X: Dicotyledons with united petals, flower 

 parts in four whorls. 



ORDER POLEMONIALZS. 



1182. Lesson XIX. 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" (La- 

 mium 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, which 

 obtains in nearly all the members, 

 the family receives its name of 

 Labiatce. The calyx is five-lobed. 

 The stamens, four in number, 

 arise from the tube of the corolla, 

 and converge in pairs. The 

 ovary is divided into four lobes, 

 maturity of the seed these form four nutlets. 



694 



at the 



