COXTSXTS. 



Section 1. 

 the stem ob ascending axis 



Internal Stnicture of the Stem in general 



A. Exogenous or Dicotyledonous Stem 



1. Pith or Medulla . 



2. The Wood .... 



Dm'amen and Alburnum . 

 Age of Trees 

 Size of Trees . 

 Cambium-layer or Cambium 



3. Medullary Eays . 



4. The Bark or Cortical System 



a. The Liber, Inner Bark, or Endophl 



b. The Cellular Envelope, Grreen Lay 



Mesophlceum 

 Suberous, Corky Layer, or EpiphL 

 Growth of the Bark 



B. Endogenous or Monocotyledon ous Stem 



C. Acrogenous or Acotyledonous Stem 



2. Buds and Eamification .... 



Buds or Leaf-buds 



Ramification 



1. Non-development of the Regular Buds 



2. Adventitious Buds 



Embryo Buds .... 



3. Accessory Buds .... 



3. Of the Forms and Kinds of Stems and Branches 



Spine or Thorn 



Tendril or Cirrhus ..... 

 Kinds of Stem 



1. Aerial Modifications of the Stem 



' a. The Runner .... 



b. The Offset 



c. The Stolon 



d. The Sucker .... 



e. The Rhizome or Rootstock . 



2. Subterranean Modifications of the Stem 



a. The Creeping Stem . 



b. The Tuber .... 



c. The Bulb 



d. The Corm 



79 

 iceum 80 

 er, or 



Section 2. 

 the root or descending axis 

 1. True or Primary Root . 



112 

 112 



