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 Rwanda flora team(2026). Flora of Rwanda: Glossary details: corona. https://www.rwandaflora.com/speciesdata/glossary-display.php?glossary_id=169, retrieved 27 January 2026
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