Zannichellia palustris

Zannichellia palustris, the horned pondweed,^[1] is a plant found in fresh to brackish waters in the United States (especially in the Chesapeake Bay),^[2] 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.^[3] A diploid, its chromosome number was confirmed as 2n = 24.^[4]

Zannichellia palustris
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Alismatales
Family:	Potamogetonaceae
Genus:	Zannichellia
Species:	Z. palustris
Binomial name
Zannichellia palustris L.