Axial parenchyma | |_ Apotracheal axial parenchyma {Axial parenchyma absent or extremely rare , Paratracheal axial parenchyma , Banded parenchyma}
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|_ Paratracheal axial parenchyma {Axial parenchyma absent or extremely rare , Apotracheal axial parenchyma , Banded parenchyma}
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|_ Banded parenchyma {Axial parenchyma absent or extremely rare , Apotracheal axial parenchyma , Paratracheal axial parenchyma}