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Elodea schweinitzii
Also called Canadian Pondweed, Canada Waterweed, American Duckweed, Canadian Elodea, Oxygen Weed, Water Thyme, Waterweed
Elodea schweinitzii, commonly known as Schweinitz's waterweed, is a possibly extinct species of aquatic plant endemic to New Jersey, New York, and Pennsylvania. The holotype was collected by Lewis David de Schweinitz, but was given no locality data. Schweinitz, however, collected other specimens from Bethlehem, Pennsylvania, some or all of which were likely isotypes. Elodea schweinitzii has not been recorded from Pennsylvania since Schweinitz's last collection made in 1832.
Elodea densa · Twoleaf waterweed · Canadian waterweed · Western waterweed · Waterweed
Text excerpted from the Wikipedia article Elodea schweinitzii by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
