any fernlike, aquatic marsh plant of the genus Isoëtes, characterized by clustered, quill-like leaves bearing sporangia in their bases.
Origin of quillwort
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Historical Examples of quillwort
Professor Lang has published the first of a series of communications describing the structure of the Quillwort, Isoetes.The Annual Register 1914
any aquatic tracheophyte plant of the genus Isoetes, with quill-like leaves at the bases of which are spore-producing structures: family Isoetaceae, phylum Lycopodophyta (club mosses, etc)
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