Juncus scirpoides
Scirpus-like rush

Key Characteristics

Perennial rhizomatous rush of seasonally wet sandy soils; leaves round and hollow with hard cross-partitions; inflorescence terminal, globose; capsules slender, taller than tepals; seeds without pale tails; stamens 3.

Status and Rank

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

Occurrences

County NameNumber of OccurrencesYear Last Observed
Allegan32014
Barry11970
Berrien42010
Kalamazoo21942
Muskegon11983
Newaygo12015
St. Clair22008
Van Buren52016
Distribution map for Juncus scirpoides

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 in areas with a fluctuating water table such as coastal plain marshes, sandy lake edges, dune swales, seepages, sandy marshes, sandy and peaty edges of wetlands, and intermittent wetlands.

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-awned grass, prairie cordgrass, tooth-cup, bog clubmoss, autumn sedge, big bluestem, Indian grass, little bluestem, yellow-eyed grass, umbrella-grass, black-fruited spike-rush, lance-leaved violet, grass-leaved goldenrod, Smith's bulrush, mountain mint, nut-rush, panic grass, and ladies tress orchid.

Management

Requires conservation and protection of hydrology of intermittent wetlands. It is also vulnerable to ORV impacts and dredging and filling of sites. In certain prairie-like habitats, it may benefit from prescribed fire.

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 21, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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