In botany, describing structures that grow or are attached upon the petals of a flower.
From epi- (upon) + petalous (relating to petals), derived from Greek petalon (leaf, petal). This botanical term specifically indicates positioning on the petal surface rather than elsewhere in the flower.
Nature's origami gets specific here—botanists use this word when stamens or other flower parts are literally sitting on top of the petals like tiny passengers on a colorful leaf-ship!
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