CALYX. U 



2. The Involucre is remote from the corolla, 

 and placed at the foot of what is called an Umbel ; 

 a collection of flower-stalks, diverging from one 

 point, fig. 2, ph 2. 



It consists either of one or more leaves, and is 

 called, according to their number, Monophyllous, 

 Diphyllous, &c. When placed at the foot of the 

 general umbel, fig. 2, « it is called a general invo- 

 lucre ; and when at the foot of a partial umbel, 

 fig. 2, * it is called a partial involucre. 



These involucres are not always present : in 

 Cowparsley, (Chaerophyllum) the partial involucre 

 only is present, fig. 1, pi. 6 ; in Parsnip, (Pasti- 

 naca) both general and partial involucres are 

 wanting.* 



3. The Catkin consists of many leaves (leaf- 

 lets) attached to a thread-like receptacle, as in the 

 Hasel, (Corylus) fig. 3, pi. 2. 



In those plants where the Catkin contains 

 seeds, it hardens and enlarges, and is a permanent 

 protection for them until ripe ; but in others, in 

 which the catkin contains stamens only, it falls off 

 as soon as the Anthers have shed their pollen : (an 



* The gjeen leaves which surround the florets of compound flowers, 

 such as the Daisy, Dandelion, and Blue-bottle, are also designated 

 an Involucre. Fig. 1, " pi. 19. 



C 



