Hill's Pondweed (Potamogeton hillii)

Global Rank: G3 - Vulnerable
Legal Status: N/A
Family: Potamogetonaceae
State: CT, MA, MI, NY, OH, ON, PA, VA, VT, WI
Nature Serve ID: 129028
Lifeform: Forb/herb
Date Inducted in National Collection:

Description:

Potamogeton hillii, or Hill’s pondweed, is a perennial, aquatic member of the pondweed family. It is found in the Northeastern and upper Midwestern USA and Ontario. It is an obligate wetland species, that typically grows in alkaline or calcareous, clear water. Is can be confused with P. foliosus, but P. hillli tends to have longer leaves (approximately 0.8 – 2.3 inches long) and has three ridges (keels) on its fruit. All of P. hilli’s leaves are submerged, but its flowering stalk extends above the surface of the water. It has small, non-showy green flowers. Hill’s pondweed is of conservation concern because it is fairly uncommon throughout its range and has a narrow habitat preference. Also, because it is an obligate wetland species, it can be threatened by anything that disturbs a sites hydrology or diminishes water quality. (COSEWIC, 2005; NatureServe, 2017; New England Wildflower Society, 2017; USDA and NRCS, 2017)

Where is Hill's Pondweed (Potamogeton hillii) located in the wild?

Habitat:

lakes streams

Distribution:

States & Provinces:

Hill's Pondweed can be found in Connecticut, Massachusetts, Michigan, New York, Ohio, Ontario, Pennsylvania, Vermont, Virginia, Wisconsin

Which CPC Partners conserve Hill's Pondweed (Potamogeton hillii)?

Native Plant Trust

Not Sponsored

Assigned 06/09/17

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Hill's Pondweed (Potamogeton hillii) Characteristics

Nomenclature

Taxon	Potamogeton hillii
Authority	Morong
Family	Potamogetonaceae
CPC Number	3600
ITIS	39034
USDA	POHI4
Duration	Perennial
Common Names	Hill's Pondweed
Associated Scientific Names	Potamogeton hillii \| Potamogeton porteri
Distribution	NA

State Rank

State	State Rank
Connecticut	S1
Massachusetts	S3
Michigan	S2
New York	S2
Ohio	S1
Ontario	S2
Pennsylvania	S1
Virginia	S1
Vermont	S3
Wisconsin	S1

Ecological Relationships

Photos

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