plural of quillwort

Any of various simple microphyllous vascular plants, of the family Isoetaceae, that resemble rushes and produce spores.

plural of lake quillwort

A boreal quillwort, Isoetes lacustris, native on both sides of the northern Atlantic Ocean.

A species of quillworts, Isoetes echinospora.

plural of spring quillwort