HOW PLANTS MARRY. 



89 



in ^ the harebell and the gentian, it has five 

 points, or lobes, unit it at the base into a single 

 piece (Fig. 17). Last of all, outside the corolla 

 again comes another row or layer, called the 

 calyx^ which sometimes consists of five separate 

 leaves or sejmls, as in the dog-rose and the butter- 

 cup, but sometimes has five points, welded at 

 the base into one piece, as in red campion and 



FIG. 17. — FLOWER OF A SHRUBBERY PLANT, WEIGEIJA, 

 WITH THE PETALS UNITED INTO SINGLE COROLLA. 



I. Entire flower. II. The same, with part of the 

 corolla cut away. III. and IV. A str.men. A-, 

 calyx ; h, corolla ; ,s, stamen ; a, anther of the 

 stamen ; g and n, parts of the pistil. 



convolvulus. It is these last comparatively- 

 unessential but very conspicuous parts that 

 most people think of when they say " a flower." 



What is their use ? Well, they are not essen- 

 tial, like the pistil and stamens, because many 

 flowers, perhaps even most flowers, do without 



