Synonyms
Isoetes echinospora subsp. flettii (A.A.Eaton) Piper & Beattie
Isoetes lacustris subsp. paupercula (Engelm.) Feilberg
Isoetes occidentalis var. piperi A.Nelson & J.F.Macbr.
Isoetes lacustris var. paupercula Engelm.
Isoetes echinospora f. flettii (A.A.Eaton) Clute
Isoetes echinospora var. flettii A.A.Eaton
Isoetes howellii var. piperi Clute
Isoetes paupercula A.A.Eaton
Isoetes piperi A.A.Eaton
Isoetes maritima var. flettii (A.A.Eaton) C.F.Reed