Petal | Encyclopedia.com
https://www.encyclopedia.com/plants-and-animals/botany/botany-general/petal
WEBMay 23, 2018 · petal, one of the four basic parts of a flower [1], next innermost organ from the sepal. The whorl of petals is known collectively as the corolla [Lat.,=little crown]. The number of petals is usually constant within groups (e.g., five in the rose family), as are the numbers of the other organs.
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