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Any of several vascular, spore-bearing, aquatic or marsh plants of the genus Isoetes, having quill-like leaves.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(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)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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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
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