In botany, describing flowers that do not open or bloom, or plants that reproduce without their flowers opening.
From Greek 'a-' (not) + 'kleistos' (closed), literally 'closed' or 'not opening,' used in botanical terminology to describe flowers remaining sealed.
Some plants never open their flowers but still make seeds through self-pollination inside the sealed bud — they're nature's introverts, solving the reproductive problem without ever showing off their petals.
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