⚠ Version 1 of The Plant List has been superseded.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 Utricularia williamsii in version 1.1 of The Plant List.
This name is a synonym of Utricularia amethystina .
The record derives from Tropicos which reports it as a synonym (record 18300405
) with original publication details: Ceiba 1(2): 126 126 1950.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:260874-2
.