Having been folded together lengthwise; in a state of being doubled or folded.
Past participle of conduplicate, maintaining the same Latin roots (con- + duplicatus) but emphasizing the completed or existing state of folding.
This is the descriptive form you'd use to describe actual leaves or petals you're observing—it's 'conduplicate' as a happening action versus 'conduplicated' as what you see.
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