This name is a synonym of Sphagneticola trilobata (L.) Pruski.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 80AC645B-D3EC-4595-A1B7-38AF7E7BF6EE).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Wedelia paludosa in version 1 of The Plant List.