Carex atratiformis
Sedge
Image of Carex atratiformis

Photo by Susan R. Crispin 

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Key Characteristics

Loosely clumped sedge of rocky shores; leaves narrow (3-5 mm); terminal spikelet at least partially pistillate; pistillate spikelets drooping on long peduncles.

Status and Rank

  • State Status: T
  • State Rank: S2
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Keweenaw111994
Marquette11914
Distribution map for Carex atratiformis

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 rocky beaches and crevices in bedrock along the Lake Superior shoreline.

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 cedar, balsam fir, paper birch, lowbush blueberry, eastern ninebark, thimbleberry, big-leaved aster, violet butterwort, pale Indian paintbrush, starflower, harebell, ticklegrass, yarrow, bearberry, marsh bellflower, hair grass, spike-rush, butterwort, silverweed, dwarf Canadian primrose, wild rose, and mosses.

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 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 Dec 18, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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