Plants and Animals
Potamogeton vaseyi Vasey's pondweed
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
US Status: No Status/Not Listed
State Status: T - Threatened (legally protected)
Global Rank: G4 - Apparently secure
State Rank: S1S2 - Rank is uncertain, ranging from critically imperiled to imperiled
|County||Number of Occurrences||Year Last Observed|
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.
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
- Inland lake, littoral, benthic
- Submergent marsh
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.
Water-milfoil, pickerel weed, three-square, pondweed, and wild celery.
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).
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.
Survey Period: From first week of July to fourth week of August
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