This name is a synonym of Ricciocarpos natans (L.) Corda.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35190096) with original publication details: Syst. Nat. (ed. 10) 2: 1339 1759.
This name was in version 1 of The Plant List, record tro-35190096, and has not been changed.