120 



STRUCTURAL BOTANY. 



Spear-grass, Catalpa. A thyrse is a sort of compact, oblong, 01 

 pyramidal panicle, as in Lilac, Grape. 



361. 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 ca- 

 pitulum are seen in the Com- 

 posite, where the summit of 

 the peduncle, that is, the re- 

 ceptacle, is dilated, bearing the 

 sessile flowers above, and scale- 

 like bracts around, as an in- 

 volucre. 



362. The capitulum of the 



Composite is often called a 44fi 



rr>mrrmnrl flnwov frrk-m itc vo ^ Vernonia fnsciculata flowers in a discoid 



Compound nOAVCl IlOin ItS 1C- head^with an Imbricated JnTolncre. 447, A single 



-i -i ,- -, flower remaining on the receptacle. 448, A fruit 



Semblance, the inVOlUCre an- crowned with the pappus. 449, Mulgedium ahead 



4fiU, A single flower remaining on the receptacle. 



sweriDg to a calyx, the rays to 451 . A fruit wi t pappus. 

 the corolla. The flowers are called florets those of the outer 

 circle, jtforete of the ray, generally differing in form from those 

 of the central portions, I\\Q florets of the disk. 



363. Of terminal inflorescence the following varieties are 

 described: cyme, fascicle (verticillaster), and glomerule. 



^A-^** * 



453 



452 



Diagrarc (452) of cyme; flowers numbered in the order of their development. 153, Oyme fastigiate. 

 454, Cyme half developed a scorpoid raceme. 



364. Cyme is a general term denoting any inflorescence with 

 centrifugal evolutions, but is properly applied to that level- 

 topped or fastigiate form which resembles the corymb, as in the 



