a cap-like or lid-like covering of certain fruits or flowers that comes off in one piece. E.g. the perianth forms a calyptra which comes off when a Eucalyptus flower opens.
The DRC flora team(2025). Flora of the Democratic Republic of Congo: Glossary details: calyptra. https://www.drcongoflora.com/speciesdata/glossary-display.php?glossary_id=98, retrieved 31 March 2025
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