INFLORSBCENCE. 



73 



themselves umbels, as in caraway and most of the Umbeliferse, a com- 

 pound umbel is produced. Such secondary umbels are called umbellets 

 and the primary pedicels, rays. 



^ 352. The panicle is a compound inflorescence formed by the irregu- 

 lar branching of the pedicels of the raceme, as in oats, spear-grass, 

 Catalpa. 



X' 353. A THYKSE is a sort of compact, oblong, or pyramidal panicle, as 

 in lilac, grape. 



354. A HEAD OR cApiTULUM is a sort of reduced umbel, having the 

 flowers all sessile upon the top of the peduncle, as in the button snake- 

 root, button-bush, clover. 



But the more common examples of 

 the capitulum are seen in the Oompos- 

 itae, where the summit of the peduncle, 

 that is, the receptacle, is dilated, bear- 

 ing the sessile flowers above, and scale- 

 like bracts around, as an involucre. 



355. The capituldm of the 

 Composite is often called a com- 

 pound flower from its resem- 

 blance, the involucre answering 

 to a calyx, the rays to the corolla. 

 The flowers are called florets, 

 those of the outer circle, ^ore<«. 

 of the ray, generally differing 

 in form from those of the cen- 

 tral portions, the florets of the 

 dish. 



356. Of terminal inflorbs- 

 cbnok the following varieties 

 are described : cyme, fascicle 

 (verticilaster), glomeruli. 



Vernonia fnsciculata; flowers in a discoid 

 head with an imbricated involucre. 211, A 

 single flower remaining on the receptacle. 312, 

 A fruit crowned with the pappus. 218, Mulge- 

 dium ; a head. 214, A single flower remaining 

 on the receptacle. 216, A fruit with pappus. 



216 



Diagrams; Sieofacyme; flowers numbered in the orderof their .development. 217, Cyme fea- 

 tlgiate. 218, Cyme half developed— a scorpoid raceme. 



y^ 857. Cyme is a general term denoting any inflorescence with centri- 



