Eleocharis parvula
Dwarf spike-rush

Key Characteristics

Very small mat-forming spike-rush (5 cm) of salt marshes; culms arising from rhizomes with curved tubers; stems very slender topped by tiny elliptical spikes (2-4 mm long); achenes light brown.

Status and Rank

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

Occurrences

County NameNumber of OccurrencesYear Last Observed
Clinton21982
Ionia11887
Distribution map for Eleocharis parvula

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

Known only from a floodplain salt marsh community created by the upwelling of a brine spring along the Maple River.

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

Three-square, Olney's bulrush, and water-plantain.

Management

Maintenance of hydrology is essential for this species, which may be vulnerable to excessive human trampling and disturbances due to potential recreational activities. Invasive species may also pose a threat, since habitat is very limited.

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 22, 2017]

References

Survey References

Technical References

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