
1) Fern ally 2) Worldwide except Polynesia
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https://www.crosswordclues.com/clue/quillwort

• (n.) Any plant or species of the genus Isoetes, cryptogamous plants with a cluster of elongated four-tubed rushlike leaves, rising from a corm, and containing spores in their enlarged and excavated bases. There are about seventeen American species, usually growing in the mud under still, shallow water. So called from the shape of the shape o...
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http://thinkexist.com/dictionary/meaning/quillwort/

(Isoetes species), any of more than 60 species of small plants that constitute the genus Isoetes, of the order Isoetales (class Lycopsida). They are ... [6 related articles]
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http://www.britannica.com/eb/a-z/q/7

<botany> Any plant or species of the genus Isoetes, cryptogamous plants with a cluster of elongated four-tubed rushlike leaves, rising from a corm, and containing spores in their enlarged and excavated bases. There are about seventeen American species, usually growing in the mud under still, shallow water. So called from the shape of the shap...
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http://www.encyclo.co.uk/local/20973
Quill'wort` noun (Botany) Any plant or species of the genus
Isoetes , cryptogamous plants with a cluster of elongated four-tubed rushlike leaves, rising from a corm, and containing spores in their enlarged and excavated bases. There are about seventeen American species, usually growing in th...
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http://www.encyclo.co.uk/webster/Q/10

[
n] - any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills
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http://www.webdictionary.co.uk/definition.php?query=quillwort
noun any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills; worldwide except Polynesia
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https://www.encyclo.co.uk/local/20974

any fernlike, aquatic marsh plant of the genus Isoëtes, characterized by clustered, quill-like leaves bearing sporangia in their bases.
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https://www.infoplease.com/dictionary/quillwort
No exact match found.