Potamogeton pulcher
Spotted pondweed
Image of Potamogeton pulcher

Photo by Russ Schipper 

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Key Characteristics

Aquatic plant of shallow softwater lakes; stem and petioles with black spots; submerged leaves lanceolate with wavy margins (1-3 cm wide); floating leaves oval (2-5 cm wide) and slightly indented (cordate) at the base.

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Barry11985
Berrien21974
Cass11938
Cheboygan11980
Emmet11980
Newaygo12015
Distribution map for Potamogeton pulcher

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

Michigan collections have come from 1-9 feet of water, usually rooted in a peaty bottom, with one collection obtained from a sandy-gravelly lake bottom substrate.

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

White water-lily, water-shield, and slender naiad.

Management

Spotted pondweed requires protection of habitat and maintenance of lake hydrology.

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 Aug 23, 2017]

References

Survey References

Technical References

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