Ferns, lycophytes, and their extinct free-sporing relatives
Isoetes occidentalis
Isoetes occidentalisHend.
Family: Isoetaceae
[Isoetes echinospora f. flettii (A.A.Eaton) Clute, moreIsoetes echinospora subsp. flettii (A.A.Eaton) Piper & Beattie, Isoetes echinospora var. flettii A. A. Eat., Isoetes flettii (A. A. Eat.) N.E. Pfeiffer, Isoetes howellii f. piperi (Eaton) Clute, Isoetes howellii var. piperi (Eaton) Clute, Isoetes lacustris subsp. paupercula (Engelm.) Feilberg, Isoetes lacustris var. paupercula Engelm., Isoetes macrospora f. paupercula (Engelm.) Clute, Isoetes maritima var. flettii (Eaton) Reed, Isoetes occidentalis subsp. paupercula (Engelm.) Feilberg, Isoetes occidentalis var. piperi (A. A. Eat.) A. Nelson & J.F. Macbr., Isoetes paupercula (Engelm.) A. A. Eat., Isoetes piperi A. A. Eaton]