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\Definition of perianth
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From the Editors at Merriam-Webster
Opening Up on the Names of Flower Parts
Opening Up on the Names of Flower Parts
Stopping to smell (and examine) the roses
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“Perianth.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/perianth. Accessed 14 December 2019.
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Time Traveler for perianth
The first known use of perianth was circa 1806
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