the Science of Botany. 3 7 



The parts of the flower, plate IV. 



L The cup of the flower [calyx)^ is that 

 which inclofes or fuftains the other parts ; thefc 

 are divided into the feven following forts, the 

 perianthium^ the involucrum^ the fpatha^ glu^ 

 ma^ amentum ovjulus^ calyptra^ and volva. 



TliQ peria72thium is the mofl common fort of 

 flower cup 3 it is often compofed of many parts, 

 or when it is of one part or piece, it is divided 

 or cut half way into more or lefs parts 3 this al- 

 ways furrounds the flower. 



The involiicrum or outer cover embraces 

 many flowers, which are coUefted together, and 

 have each their proper perianthium* They are 

 difpofed in form of rays, and are fometimes 

 coloured ; fee fig. 1, a^ a^ a. This is often met 

 with in the fecond order of Limtaus's fifth 

 clafs, which includes the plants with umbel- 

 lated flowers. 



The fpatha or (heath is a particular fort of 

 cover to one or feveral flowers, which feldom 

 are provided with any particular perianthium i 

 it confifl:s of a membrane fafl:ened to the flalk, 

 and is of different figures and confiflence, as 

 the Arum, fee fig. 2. b, b, b. 



It is fometimes compofed of two pieces, as 

 at fig. 2. c, c\ this often occurs in Linnauss 

 I, III, VI, and XXth claflbs. 



c 3 Gluma 



