persicaria
noun
per·si·car·ia
ˌpərsəˈka(a)rēə
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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Merriam-Webster unabridged
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