This name is a synonym of Hydrocotyle verticillata Thunb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1702161) with original publication details: Contr. U.S. Natl. Herb. 7(1): 28 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:125114-2.
This name was in version 1 of The Plant List, record tro-1702161.