This name is a synonym of Isoetes flaccida var. alata (Small) N. Pfeiff..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26604194) with original publication details: Ferns Florida 22 1932.
This name was in version 1 of The Plant List, record tro-26604194.