CH. IV] MORPHOLOGY. 51 



present a series of rounded excrescences, those nearest the 

 point being the youngest and smallest, and those further 



FIG. 21. 



STEM OF PIMPERNEL (Anagallis). 



To illustrate the alternation of nodes and internodes. 

 (From Le Maout and Decaisne.) 



away being older and approaching more and more the 

 form of young leaves. 



If the stem is split longitudinally in such a way 



42 



