At the time of this writing, Bistorta vivipara is an inactive species with 3 active descendants and 6 observations. Persicaria vivipara is active with no descendants and 220 observations.
Personally I am more used to Persicaria but I think your reasoning is all correct and you should go ahead with the change. Presumbly several other Bistorta sp. will need changing on iNat.
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.
@tiggrx @jakob any comments/something I'm missing before we commit this?