This name is a synonym of Isoetes occidentalis L.F. Hend..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26604565) with original publication details: Fern Bull. 13: 51 1905.
This name was in version 1 of The Plant List, record tro-26604565, and has not been changed.