This name is a synonym of Marsilea vestita Hook. & Grev..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26604988) with original publication details: Bull. Torrey Bot. Club 14: 92 1887.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:153676-2.
This name was in version 1 of The Plant List, record tro-26604988.