Vascular Plants of North Carolina
Account for Alga-like Pondweed - Potamogeton confervoides   Reichenbach
Members of Potamogetonaceae:
Members of Potamogeton with account distribution info or public map:
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Section 5 » Order Najadales » Family Potamogetonaceae
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AuthorReichenbach
DistributionPrimarily found in the Sandhills region of the southwestern Coastal Plain; a few widely scattered records elsewhere in the Coastal Plain.

This is primarily a Northern species, ranging from eastern Canada south to NJ and MN, and then highly disjunct south to NC and central SC (mainly in the Sandhills region), with no records yet for DE, MD, or VA.
AbundanceUncommon and scattered in the Sandhills, but very rare elsewhere in the Coastal Plain. The NCNHP database contains 20 records for the species. This is a Significantly Rare species.
HabitatThis is a species of strongly acidic and generally still to slow-moving waters, of blackwater impoundments and streams. Most records are from millponds or other man-made lakes, though several are from creeks; the substrates are usually sandy but can be peaty.
See also Habitat Account for Coastal Plain Herbaceous Ponds and Sloughs
PhenologyFlowers and fruits from April to September.
IdentificationThis is an extremely slender submerged plant in all respects, with no floating leaves. The stem is highly branched, to about 1.5-2 feet long, and practically filiform, as are the leaves. These leaves are alternate, strongly palmately branched into very filiform segments; leaves are about 1.5-2 inches long. The spike is generally single on a plant, on a very long stalk about 4-6 inches long, with the inflorescence only about 1/3-inch long and rather capitate/conical. This is generally the only pondweed with extremely filiform leaves growing in strongly blackwater ponds and creeks.
Taxonomic CommentsNone

Other Common Name(s)Conferva Pondweed, Alga Pondweed, Tuckerman's Pondweed
State RankS2
Global RankG5
State StatusSR-D
US Status
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BA SorrieBeaver Pond at Thrower Lane, Sandhills Game Land. RichmondPhoto_natural
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