ANGIOSPERM^E 



365 



specialized forms related to these, like the Morning-glory or Nemo- 

 phila, the flowers are actino- 

 morphic, and the number of 

 stamens is the same as the 

 corolla lobes. 



In the Compositae (Daisy, 

 Sunflower, etc.), which are 

 usually considered to be the 

 most specialized of the Di- 

 cotyledons, there is often .a 

 division of labor among the 

 flowers. In a large number 

 of them there are developed 

 the so-called " Bay-florets " 

 (Fig. 329, B), which are often 

 quite sterile, and serve merely 

 to make the inflorescence 

 conspicuous. 



All of these modifications 

 of form are associated with 

 adaptations to cross-pollina- 

 tion, and with them are to 

 be classed the extraordinary 

 development of color and 

 scent in flowers. 



Fia 330 Cyme of Tilia Americana. 

 (After BAILEY.) 



The Inflorescence 



(Figs. 327-331.) A flower may be formed singly at the end of 

 the shoot, as in most species of Naxcissus, Trillium, Sanguinaria, 

 etc. Such a floral axis is called a Scape. Much more commonly, 



FIG. 331. Compound cyme of Hydrangea arborescens. 



