Two little boys in botany (5)

I believe the answer is:

sepal

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But I can't explain it at all! Could you help me understand?

(Other definitions for sepal that I've seen before include "Part of a flower's outer envelope" , "Enclosing part of flower" , "Part of a flower - peals (anag)" , "Part of the calyx of a flower" , "Violet" .)

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