CPC Plant Profile: Hill's Pondweed
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Plant Profile

Hill's Pondweed (Potamogeton hillii)

© 2017 Donald Cameron Photo Credit: Donald Cameron
Description
  • Global Rank: G3 - Vulnerable
  • Legal Status: N/A
  • Family: Potamogetonaceae
  • State: WI, CT, MA, MI, NY, OH, ON, PA, VA, VT
  • Nature Serve ID: 129028
  • Date Inducted in National Collection: 12/07/2021

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)

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Nomenclature
Taxon Potamogeton hillii
Authority Morong
Family Potamogetonaceae
CPC Number 3600
ITIS 39034
USDA POHI4
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
Habitat

lakes streams

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID

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