test
node1
PO:0000003
whole plant
node2
PO:0025280
microgametophyte
node1->node2
node3
PO:0025131
plant anatomical
entity
node4
PO:0009011
plant structure
node3->node4
node4->node1
node5
BFO:0000004
independent
continuant
node5->node5
node6
BFO:0000040
material entity
node5->node6
node6->node3
node7
BFO:0000002
continuant
node7->node5
node7->node7
node8
BFO:0000001
entity
node8->node7