Vascular Plants of North Carolina
Account for Waterthread Pondweed - Potamogeton diversifolius   Rafinesque
Members of Potamogetonaceae:
Members of Potamogeton with account distribution info or public map:
Google Images
Section 5 » Order Najadales » Family Potamogetonaceae
Show/Hide Synonym
DistributionEssentially throughout the state.

This is one of the most numerous pondweeds in the country, being widespread across the U.S., from VT and OR south to southern FL, TX. and CA.
AbundanceFrequent to common in the Coastal Plain; fairly common to locally frequent in the rest of the state. Scarce at higher elevations in the Mountains. This is the only pondweed in NC with a State Rank of S5.
HabitatThis is a species of a variety of still waters -- pools, ponds, lakes, beaver ponds, and less so streams and ditches.
See also Habitat Account for General Herbaceous Ponds
PhenologyFlowers and fruits from June to September.
IdentificationThis is a quite familiar aquatic species across the state, often noted by the small, elliptical floating leaves. The stem is usually freely branched, growing to about 1.5 feet tall. The submerged leaves are narrowly linear to filiform, about 2-3 inches long. The floating leaves are elliptical, only about 3/4-inch long and 1/3 - 1/2 as wide, with long and slender petioles, slightly shorter than the leaves. Each leaf usually has 7 nerves/veins. The plant has numerous spikes, the upper ones cylindrical, about 1/2-inch long, and on slender stalks.
Taxonomic CommentsNone

Other Common Name(s)Diverse-leaved Pondweed, Common Snailseed Pondweed
State RankS5
Global RankG5
State Status
US Status
USACE-agcpOBL link
USACE-empOBL link
County Map - click on a county to view source of record.
Select a source
Select an occurrence type