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 Tanzania flora team(2026). Flora of Tanzania: Glossary details: calyptra. https://www.tanzaniaflora.com/speciesdata/glossary-display.php?glossary_id=98, retrieved 14 August 2026
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