LEAF-ARRANGEMENT. 103 



In the Nut (Corylus) the internodes are longer, 

 and the leaves correspondingly broader. In the 

 Elm the ordinary branches have leaves resembling, 

 though rather larger than, those of the Beech; 

 but in vigorous shoots (Fig. 22) the internodes 



FIG. 22. ELM. 



become longer, and the leaves correspondingly 

 broader and larger, so that they come nearly to 

 resemble those of the Nut. 



But it may be said that the Spanish Chestnut 

 (Castanea vulgaris, Fig. 23) also has alternate 

 leaves, in a plane parallel to that of the branch, 



