characteristic of inheres in has number of metaxylem vessel vascular tissue morphology trait number of metaxylem vessels 2017-08-17T21:15:56Z The number of metaxylem vessels (PO:0025620) may be counted in a cross section of a primary xylem (PO:0005849). TO_GIT:421 TO:0001066 A vascular tissue morphology trait (TO_0000470) which is the number of metaxylem vessels (PO:0025620). plant_trait_ontology