Isoetes longissima Bory in Compt. Rend. Hebd. Séances Acad. Sci. 18: 1165. 1844

is basionym for Isoetes velata subsp. longissima (Bory) Greuter & Burdet in Greuter & al., Med-Checklist 1: 5. 1984

has orthographic variant Isoëtes longissima

Taxon for this name