quill-wort

quillwort

[kwil-wurt, -wawrt]
noun
any fernlike, aquatic marsh plant of the genus Isoëtes, characterized by clustered, quill-like leaves bearing sporangia in their bases.

Origin:
1780–90; quill + wort2

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World English Dictionary
quillwort (ˈkwɪlˌwɜːt)
 
n
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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