Potamogeton hillii
Hill's pondweed
Image of Potamogeton hillii

Photo by Gary Fewless 

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Key Characteristics

Aquatic plant of cool northern Michigan ponds; stem slender and branched; leaves alternate, submerged, and narrow (1-2 mm), with three parallel veins.

Status and Rank

  • State Status: T
  • State Rank: S2
  • Global Rank: G3

Occurrences

County NameNumber of OccurrencesYear Last Observed
Charlevoix11984
Cheboygan21981
Emmet21982
Kalkaska11984
Mackinac11993
Missaukee11966
Otsego11981
Presque Isle11996
Distribution map for Potamogeton hillii

Updated 7/21/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

Hill's pondweed is found in cold, alkaline streams on sandy, mucky, and marly substrates. It usually occurs in water up to one meter in depth.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Associated Plants

Yellow water-lily, pondweeds, bulrush, white water-lily, and stonewort.

Management

Maintain good water quality, cool water temperatures, and a relatively natural habitat. It sometimes persists in the vicinity of developments (homes, roads) suggesting that it can survive certain types or degrees of disturbance.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Sep 22, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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