330 



COEOLLA ATJL.EUM. 



[BOOK i. 



as in Scutellaria and Salsola. These are generally named 

 appendages, and such a calyx is said to be appendiculate ; but 

 Moench has proposed a particular term for them, peraphyllum, 

 which is, however, never used. 



88 



7. Of the Corolla. 



89 90 



93 



That envelope of the flower which forms a second whorl 

 within the calyx, and between it and the stamens, is called 

 the corolla. Its divisions always, without exception, alter- 

 nate with those of the calyx, and are called petals. Like 

 the sepals, they are either united by their margins, or dis- 

 tinct ; but, unlike the calyx, they are rarely green, being for 

 the most part either white, or of some colour, such as red, 

 blue, or yellow, or of any of the hues produced by their 

 intermixture. The corolla is generally also larger than the 

 calyx. 



Necker called the corolla perigynandra interior, and Lin- 

 naeus occasionally gave it the name of aulaeum, a term literally 

 signifying the drapery of a room. 



The alternation of the segments of the corolla with those 

 of the calyx is a necessary consequence of their both being 

 modifications of whorls of leaves, and therefore subject to 

 the same laws of arrangement. If two whorls of leaves are 

 examined, those of Galium, for example, they will always be 



