{{Short description|Species of aquatic plant}} {{speciesbox |image=ZannichelliaPalustris3.jpg |genus = Zannichellia |species = palustris |authority = L. }}
'''''Zannichellia palustris''''', the '''horned pondweed''',<ref name=invasion>{{cite news |first=Simon |last=Hadlington |title=Science & nature: Invasion of the Lakes; Eighty years ago, a naturalist surveyed the Lake District's aquatic plant life. Ecologists recently repeated his work. The changes they found, says SIMON HADLINGTON, provide a stark warning |work=The Independent |pages=12 |date=2003-02-24}}</ref> is a plant found in fresh to brackish waters in the United States (especially in the Chesapeake Bay),<ref name=grass>{{cite web |url=http://www.dnr.state.md.us/Bay/sav/key/horned_pondweed.asp |title=Horned Pondweed |access-date=2009-04-18 |publisher=Maryland Department of Natural Resources |archive-date=2009-01-16 |archive-url=https://web.archive.org/web/20090116090520/http://www.dnr.state.md.us/bay/sav/key/horned_pondweed.asp |url-status=dead }}</ref> Europe, Asia, Australasia, and South America. It is recognizable by its long, thread-like leaves and "stringy" appearance. Its roots are long and tendril-like, and its seeds bear a distinctive horned shape, hence the common name. The species epithet ''palustris'' is Latin for "of the marsh" and indicates its common habitat.<ref>Archibald William Smith {{google books|ahNMkgoNJ7IC|A Gardener's Handbook of Plant Names: Their Meanings and Origins|page=258}}</ref> A diploid, its chromosome number was confirmed as 2''n'' = 24.<ref>Norio Tanaka, Yu Ito, Ruriko Matsuyama and Koichi Uehara (2007) Chromosome numbers of ''Zannichellia'' L. (Zannichelliaceae) in Japan. Bulletin of the National Museum of Nature and Science. Series B 33: 133-136</ref>
==References== {{Reflist}}
{{Taxonbar|from1=Q159194|from2=Q146973}}
Category:Potamogetonaceae Category:Aquatic plants Category:Flora of Europe Category:Flora of Northern America Category:Flora of temperate Asia Category:Plants described in 1753 Category:Botanical taxa named by Carl Linnaeus
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