This name is a synonym of Isoetes colombiana (T.C. Palmer) H.P. Fuchs.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50308448) with original publication details: Amer. Fern J. 19: 18 1929.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:321598-2.
This name was in version 1 of The Plant List, record tro-50308448, and has not been changed.