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Any of several vascular, spore-bearing, aquatic or marsh plants of the genus Isoetes, having quill-like leaves.
(Plants) 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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|Noun||1.||quillwort - any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills; worldwide except Polynesia|
fern ally - pteridophytes of other classes than Filicopsida