This name is a synonym of Hydrolea spinosa L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50254781) with original publication details: Bot. Exch. Club Soc. Brit. Isles 3: 419 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:125256-2.
This name was in version 1 of The Plant List, record tro-50254781.