depends on structure
has visible part
quality of
whole plant
open flower head
plant structure presence
open flower head presence
open flower heads absent
An 'open flower head presence' (PPO:0002041) trait that is a 'quality of' (RO:0000080) a 'whole plant' (PO:0000003) that does not have any open flower heads (PPO:0001038).
pollen-releasing flower heads absent