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 DRC flora team(2026). Flora of the Democratic Republic of the Congo: Glossary details: perianth. https://www.drcongoflora.com/speciesdata/glossary-display.php?glossary_id=527, retrieved 18 February 2026
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