structure of woody plants
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secondary phloem 
outer bark
cork and cork cambium
secondary growth in roots
angiosperms and roots of conifers undergoes secondary growth like stems
the wood produced in roots and stem are same
tissue in the stem of a plant that gives rise to cork on its outer surface and a layer of cells containing chlorophyll on its inner surface
inner cell remain cork cambium while outer becomes cork after division
all cells are cuboidal
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phellogen
pith
procambium
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interfascicular cambium
fascicular cambium
analogous form of growth
secondary growth in monocots
roots of sweet potatoes
axial system
radial system run parallel to radii that pass through the center of the axis
secondary xylem
growth ring
heartwood and sapwood
types of wood cells
reaction wood
axial system
consists of tracheids and trachery elements
consists of fibers
derived from fusiform initials
found on branches
reaction wood in place of normal wood where cambium cell are oriented than vertically
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heartwood is dark while sapwood is light in color
main function of the heartwood is to support the tree
gives water and nutrients from rots to the leaves
during a single growth period ncrement of wood
a concentric layer wood, shell or bone
radial system
derived from ray initials
ray parenchyma cell