INFLORESCENCE. 



SI 



resemble the petals of one 

 corolla, and the involucre, 

 formed of many imbricated 

 scales, resembles a calyx. This 

 head is often called a com- 

 pound flower. The outer flo- 

 rets are the florets of the ray, 

 the interior are the florets of 

 the disk. See all this illus- 

 trated in Figs. 245-250. 



157. The forms of inflo- 

 rescence heretofore described 

 result trora axillary buds ; 

 but the three following come 

 from terminal buds. Cyme is 

 the general name given to all 

 the forms of terminal inflores- 

 cence. You may recognize 



Fig. 245. Head of Blue Milkweed 

 (Mulgtdiwm) ; all its florets are lijriihue. 

 Fig. 246. A view of one of them remain- 

 ing on the receptacle. Fig. 247. A fruit 

 crowned with its pappus. 



Fig. 248. Heads of Ironweed (Ferno- 

 nia) ; 1 11 its florets are tubular. Fig. 249. 

 leptacle. 



them by the Order in which One of them remaining on 



. - r f*9> 25 - Fruit - 



the flowers open. Thus, in 



the cyme, the terminal and central rlowers open first, but in 



the forms before mentioned, the lowsr and outer flowers first. 



158. When the cyme is spreading and level-topped, we call 

 it a cymous corymb, as in the common Elder ; and when not 

 level topped, it may become a cymous panicle, as in Chick- 

 weed (Fig. 251), Spcrgula, and Staff-tree (Fig. 234:). 



159. The scorpoid cyme is a very remarkable form of in- 



157. Are tlie forms hitherto described terminal or axillary ? Please define 

 the cyme. 



1 58. Cymose corymb ; Cymose panicle. 



159. What is a scorpoid cyme ? Name and describe the inflorescence of 

 Bunch Piuk ; the inflorescence of Catmint. 



