STEMS BEARING FOLIAGE-LEAVES. 



659 



times long and sometimes short axes develop from the same shoot. Also in many 

 conifers, e.g. cedars and larches, the branches proceeding from a shoot are for the 

 most part short with needle-like leaves arranged in fascicles, and only a few of 



' 



Fig. 154. Yucca glon 



them become long axes. In Pines, on the other hand, all the leaf-bearing twigs 

 are short axes, and here we have also the remarkable circumstance that in several 

 species, e.g. the Scotch Pine (Pinus sylvestris) a lateral twig bears only two such 

 needle-leaves. Tree-ferns, Cycads, Pandaneae, Grass-trees (Xanthorrhcea), many 



