test
node1
PO:0009012
plant structure
development stage
node2
PO:0007033
whole plant
development stage
node1->node2
node6
PO:0025337
life of whole plant
stage
node2->node6
node5
PO:0028003
gametophyte
development stage
node2->node5
node3
BFO:0000015
process
node3->node1
node4
BFO:0000003
occurrent
node4->node4
node4->node3
node6->node5
node7
BFO:0000001
entity
node7->node4