Polygonum littorale is a botanical synonym of four species of plant:
Bistorta vivipara, Polygonum littorale , publish 1905, nomen illegitimum Polygonum aviculare, Polygonum littorale , published 1821, nomen illegitimum Polygonum maritimum, Polygonum littorale , published 1805 Polygonum roberti, Polygonum littorale , published 1855, nomen illegitimum