a whorl of appendages between the
petals and the stamens, sometimes united to form a ring or
cylinder, usually borne upon the petals or corolla tube (see image of Passiflora subpeltata).
The Burundi flora team(2025). Flora of Burundi: Glossary details: corona. https://www.burundiflora.com/speciesdata/glossary-display.php?glossary_id=169, retrieved 30 June 2025
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