The plural is used only when referring to multiple flowers. Each flower bears a single perianth.
"perianths." YourDictionary, n.d. Web. 23 March 2019. <https://www.yourdictionary.com/perianths>.
perianths. (n.d.). Retrieved March 23rd, 2019, from https://www.yourdictionary.com/perianths
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