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Potamogeton pulcher Tuckerman

Photo: Potamogeton pulcher

Spotted Pondweed

Habitat: Peaty or muddy acid waters or shores. [Open water (non-forested, wetland)]

Range: Documented from Nova Scotia to Florida and Alabama, mainly along the coast; southern Indiana to Missouri and Arkansas.

Photo: Potamogeton pulcher

Aids to Identification: This pondweed is characterized by simple, black-spotted stems; narrow, lance-shaped submersed leaves; and oval floating leaves with black-spotted leaf stalks. The fruits are 3.5-4.5 mm long, flat-sided, and with 3 dorsal ridges.

Ecological characteristics: Unclear.

Phenology: Flowers June - September.

Family: Potamogetonaceae

Synonyms: None noted.

Photo: Potamogeton pulcher

Known Distribution in Maine: This rare plant has been documented from a total of 5 town(s) in the following county(ies): Cumberland, Knox, Lincoln, Penobscot, and Oxford.

Dates of documented observations are: 1979, 1990, 1995, 1999, 2002

Reason(s) for rarity: At northern limit of range.

Conservation considerations: Maintain water quality of the ponds in which it occurs. Invasive aquatic plants could pose a threat to populations.

Photo: Potamogeton pulcher specimen