test
node1
BFO:0000040
material entity
node2
PO:0025131
plant anatomical
entity
node1->node2
node6
PO:0009011
plant structure
node2->node6
node3
BFO:0000001
entity
node4
BFO:0000002
continuant
node3->node4
node4->node4
node5
BFO:0000004
independent
continuant
node4->node5
node5->node5
node5->node1
node9
PO:0009007
portion of plant
tissue
node6->node9
node7
PO:0009015
portion of vascular
tissue
node8
PO:0025408
primary vascular
tissue
node7->node8
node9->node7