In the primary xylem of leaf
protoxylem is lateral and metaxylem is abaxial
protoxylem is adaxial and metaxylem is lateral
protoxylem is adaxial and metaxylem is abaxial
protoxylem is abaxial and metaxylem is adaxial
In the leaves of angiosperms the Protoxylem is towards upper epidermis and Metaxylem is towards phloem or lower epidermis.