The plantParent is a recursive key to the concept of the parent level in the classification hierarchy. For example if this plantConcept were at the genus level the plantParent would be the plantConcept that is the family level (or subfamily level).
Code that uniquely references this record, allowing reference to this record for this version of this database. Better than a primary key, which is automatically generated by a database and not globally unique. VegBank Accession codes are only generated by VegBank, and therefore data integrity can be guaranteed, unlike with a primary key (number).