the outer sterile whorls or envelopes of a flower, made up of identical perianth segments, or of two different kinds of perianth segments: sepals (calyx) or petals (corolla). See also tepal.
The Burundi flora team(2025). Flora of Burundi: Glossary details: perianth. https://www.burundiflora.com/speciesdata/glossary-display.php?glossary_id=527, retrieved 4 July 2025
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