- plant anatomy
- exact: 軸系 (Japanese)
- exact: longitudinal system
- exact: sistema axial (Spanish)
- exact: vertical system
- A portion of secondary vascular tissue (PO:0025409) that has as parts cells derived from fusiform initials (PO:0000079) and oriented with their longest diameter parallel to a plant axis (PO:0025004). [source: ISBN:0471245208]
- Includes portions of secondary xylem (PO:0005848) and axial wood parenchyma (PO:0004533).
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