Polygonum angustifolium is a botanical synonym of three species of plant:
Koenigia angustifolia, Polygonum angustifolium published in 1776, a homotypic synonym and the basionym of the species Persicaria minor, Polygonum angustifolium published in 1789, heterotypic synonym, nomen illegitimum Bistorta vivipara, Polygonum angustifolium , published in 1825, heterotypic synonym, nomen illegitimum