http://purl.obolibrary.org/obo/PO_0025161 # portion of plant substance
http://purl.obolibrary.org/obo/PO_0000022 # plant cuticle
http://purl.obolibrary.org/obo/PO_0025385 # cutin
http://purl.obolibrary.org/obo/PO_0025386 # cuticular wax
http://purl.obolibrary.org/obo/PO_0025387 # plant cuticle proper
http://purl.obolibrary.org/obo/PO_0025538 # plant sap
http://purl.obolibrary.org/obo/PO_0025603 # plant resin
http://purl.obolibrary.org/obo/PO_0000003 # whole plant
http://purl.obolibrary.org/obo/PO_0025025 # root system
http://purl.obolibrary.org/obo/PO_0009005 # root
http://purl.obolibrary.org/obo/PO_0025034 # leaf