⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Polygonum rivulare in version 1.1 of The Plant List.
This name is a synonym of Polygonum hydropiperoides var. hydropiperoides .
The record derives from Tropicos which reports it as a synonym (record 50082622
).
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:696361-1
.