secondary vascular tissue axial system vertical system (exact) sistema axial (Spanish, exact) PO:0025410 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). plant_anatomy 2012-02-01T11:01:35Z 軸系 (Japanese, exact) rwalls PO_GIT:444 longitudinal system (exact) Includes portions of secondary xylem (PO:0005848) and axial wood parenchyma (PO:0004533).