Carex media
Sedge
Image of Carex media

Photo by Janet K. Marr 

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Key Characteristics

Loosely clumped sedge of rocky shores in western Lake Superior; leaves narrow (3-5 mm); terminal spikelet at least partially pistillate; pistillate spikelets crowded, sessile, and erect.

Status and Rank

  • State Status: T
  • State Rank: S2S3
  • Global Rank: G5T5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Keweenaw182014
Distribution map for Carex media

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

Found on alkaline bedrock beaches along the Lake Superior shoreline, especially on Copper Harbor conglomerate bedrock. Restricted to Keweenaw County; most occurrences are found on the Isle Royale archipelago.

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

Balsam fir, white spruce, harebell, ticklegrass, yarrow, bearberry, marsh bellflower, pale Indian paintbrush, hair grass, spike-rush, butterwort, ninebark, silverweed, dwarf Canadian primrose, wild rose, and downy oat-grass.

Management

Primarily requires protection of the shoreline habitat and perpetuation of natural disturbance (winter ice, storms, wind) and hydrological regimes. This community occupies a stressed, potentially unstable environment; many of the species found in this community do not tolerate later stages of succession and require management that prevents woody plant encroachment. Likely sensitive to excessive recreational use, such as foot traffic. Protect from impacts due to excessive development.

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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