■ INFLORESCENCE. 



81 



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 dish. See all this illus- 

 trated in Figs. 245-250. 



157. The forms of inflo- 

 rescence heretofore described 

 result from axillary buds ; 

 but the three following come ^^- ^*^- ^'"'^ °^ ^'"''- Milkweed 



„ .■.-,-, ^ (.Miilgedium) ; all its florets are ligulate. 



from tenmnal buds. Cyme is Fig. 246. a view of one of them re.-nain- 



the general name given to all ""g «" *8 receptacle. Fig. 247; A fruit 

 the forms of terminal inflores- ^^^"''n.T' J s pappps. 



I!^g. 248. Heads of Ironweed (Verno- 

 cence. You may recognize nia) ; all its Horetsare tubular. Fig. 249. 

 them by the order in which One of them remaining on the receptacle. 

 ,, fl rru • ^■^9- 250. Fruit. 



the flowers open. Ihus, m 



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



the forms before mentioned, the lower and o\iter flo\Vers first. 



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

 it a cyrnous corymh, as fn the common Elder ; and when not 

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

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



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



157. Are tlie forms hitherto described terminal or axUlary 1 Please define 

 the cyme. 



158. Cymose corjrmb ; Cymose panicle. 



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

 Bunch Pink ; the inflorescence of Catmint. 



4* 



