INFLOBESCSNCE. 



73 



themselves umbels, as in caraway and most of the Umbeliferae, 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. 



353. A THTRSE 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 Compos- 

 itas, 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 capitulum of the 

 Compositje 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, florets 

 of the ray, generally differing 

 in form from those of the cen- 

 tral portions, the florets of the 

 disk. 



356. Of terminal inflores- 

 cence THE FOLLOWINO VARIETIES 



are described: cyme, fascicle 

 (verticilaster), glomeruli. 



Vernonia fascicalata; flowers in a discoid 

 bead with an imbricated involucre. 211, A 

 single flower remaining on tbe receptacle. 212. 

 A fruit crowned with the pappus. 218, Mulgo- 

 dium ; a head. 214, A single flower remaining 

 on the receptacle. 215, A fruit with pappus. 



213 



,^ 



Diagrams J 216 of a cyme; flowers numbered in the order of their development 217, Cyme ba- 

 tigiate. 21S, Cyme half developed -a scorpoid raceme. 



357. Ctme is a general term denoting any inflorescence with centri- 



