This name is a synonym of Isoetes truncata (A.A. Eaton) Clute.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26604563) with original publication details: List N. Amer. Pterid. 27 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:130517-2.
This name was in version 1 of The Plant List, record tro-26604563, and has not been changed.