per·​si·​car·​ia | \ ˌpərsəˈka(a)rēə \

Definition of persicaria

1 plural -s : a plant of the genus Polygonum that has flowers in spicate racemes (as the lady's thumb or water pepper)
2 capitalized, [New Latin, from Latin] in some classifications : a genus of herbs (family Polygonaceae) having flowers in spicate racemes and being now usually included in the genus Polygonum

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History and Etymology for persicaria

Medieval Latin, from Latin persicum peach + -aria -ary

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“Persicaria.” Dictionary, Merriam-Webster, Accessed 5 Jun. 2020.

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