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
Word History
Etymology
Medieval Latin, from Latin persicum peach + -aria -ary