Potamogeton vaseyi
Vasey's pondweed
Image of Potamogeton vaseyi

Photo by Susan R. Crispin 

Key Characteristics

Aquatic plant of small lakes; submerged leaves very narrow (<1 mm wide) with stipules not adhering to leaf stalk; floating leaves (if present) narrowly elliptic (5-8 mm wide).

Status and Rank

  • State Status: T
  • State Rank: S1S2
  • Global Rank: G4

Occurrences

County NameNumber of OccurrencesYear Last Observed
Gogebic22011
Houghton12013
Kent22003
Oakland21939
Ontonagon12011
Distribution map for Potamogeton vaseyi

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 mostly from small lakes and recorded water depths of 6 and 12-15 feet, occurring in moderately alkaline or soft waters (pH mean of 7.2-7.6).

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

Water-milfoil, pickerel weed, three-square, pondweed, and wild celery.

Management

A status survey is needed for this species, which has only been observed once since 1940. Where found, it likely requires protection of hydrology and management of invasive species (without broad application of systemic herbicides).

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 Nov 17, 2017]

References

Survey References

Technical References

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