EXPLANATION OF THE FIGURES. 



PLATE VI. 



Fig. i. Creeping stem of Ivy (Hedera Helix) with aerial roots (a). Note great 



variety in the shape of the leaves. X f . 

 2. Erect fruiting branch of Ivy. Note how the leaves differ from those in 



Fig. i. X \. 

 3. Stem of Berber is Lycium. X \. 



(a), normal leaf in the axil of which a shoot bearing two small leaves is 



developing. Note the minute stipules at (d~) ; ( J), a three-pronged spine 



which is really a leaf as indicated by the fact that a leafy branche 



is developing in its axil. Note the minute stipules still visible at (<?). 



(0, a three-pronged green leafy structure intermediate between the normal 



leaf (a) and the spine (J). The leaf-nature is revealed by the presence 



of the leafy branch in its axil. Note also its minute stipule at (/) . 



