The two living species ( " Tetracentron sinense " and " Trochodendron aralioides " ) both have secondary xylem without vessel elements, which is quite rare in angiosperms.
12.
These three compounds seem to be the constituents of both wood ( the leftovers of cell walls of secondary xylem ) as well as Allen 02 : 38, 4 April 2007 ( UTC)
13.
The vascular cambium forms new cells on both the inside and outside of the cambium cylinder, with those on the inside forming secondary xylem cells, and those on the outside forming secondary phloem cells.
14.
:The so-called wood of monocots ( icluding palms and bamboo ) is not true wood because, although hard and " woody ", it does not grow laterally from secondary xylem but apically from primary growth.
15.
Pith composed of parenchyma cells and sclerenchyma cells, primary xylem is endarch, secondary xylem with points with halos that dominate, thick radial walls of tracheids, absence of resin canals and axial parenchyma, indicate its relationship to the family Taxaceae.
16.
The cambium tissues, i . e ., the cork cambium and the vascular cambium, are the only parts of a woody stem where cell division occurs; undifferentiated cells in the vascular cambium divide rapidly to produce secondary xylem to the inside and secondary phloem to the outside.
17.
However, the occurrence of vessel elements is not restricted to angiosperms, and they are absent in some archaic or " basal " lineages of the angiosperms : ( e . g ., Amborellaceae, Tetracentraceae, Trochodendraceae, and Winteraceae ), and their secondary xylem is described by Arthur Cronquist as " primitively vesselless ".
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