test
node1
PO:0009011
plant structure
node2
PO:0000003
whole plant
node1->node2
node3
PO:0025017
plant spore
node2->node3
node4
BFO:0000004
independent
continuant
node4->node4
node5
BFO:0000040
material entity
node4->node5
node6
PO:0025131
plant anatomical
entity
node5->node6
node6->node1
node7
BFO:0000002
continuant
node7->node4
node7->node7
node8
BFO:0000001
entity
node8->node7