:6o 



ri.AiX'r LIFE. 



as in a head (*' 104), the recejitacles are joined to ibrni a 

 large common reieptacle, as in the sunflower and its allies 

 (fig, 281). The receptacle in sm h ]i]ants maybe a cone, 

 a dome (fig. 409), or a nKjre or less flattened disk. In the 



pfMjflll 



Fig. 28S. Fig. 289. 



Fig. 288. — Flower of sweetbrier rose, halved; showing urn-shaiied torus. Conipare fig. 



139. Natural size. — After Bessey. 



Fig. 2S9. — The infioresceiice of fig, hahed lengthwise ; showing common torus on 



whose interior surface many flowers are formed. Two iig wasps are near the opening 



of the flower chamber, one outside, wliile the other has just crawled in among the 



flowers. Xatui-al size. — After Kerner. 



fig the common receptacle is pear-shaped, with the edges 

 almost meeting above and the flowers distributed over the 

 inner face of the fleshy sac (fig. 2S9). 



III. Brood buds, etc. 



361. Definition. — Smgle-celleil s]iores pass witliout anv 

 sharp distini lion into the multicellular liodics known as brood 

 buds. k'or coinenience, ho«'e\"er, brood buds m:i\- be de- 

 fined as multii cllular (sometimes unicellular) liodies capable 

 of jirodiicing a nc«' plant of the san-.t; ])hase as that from 

 which they arise. Since ihis is a distinction for con\"e- 

 nience inereh', it is not di'sirable to distiugihsh brood buds 



