A collective phyllome structure (PO:0025023) that is composed of one or more sepals (PO:0009031), and comprises the outer whorl of non-reproductive floral organs (PO:0025395).
Source:
POC:Laurel_Cooper,
POC:curators
Comment
The calyx is part of the perianth (PO:0009058). This definition is based on the perfect flower, which has all four whorls. In many species, and in mutants one or more of the whorls are missing.
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