Schoenoplectus torreyi
Torrey's bulrush
Image of Schoenoplectus torreyi

Photo by Lucinda Thomson 

Key Characteristics

Tall bulrush (1.5 m) of wetland margins; culms sharply triangular in cross-section, similar to three-square (S. pungens); spikelets appear lateral, compact; scales of spikelet broadly triangular with rounded (not cleft) tip.

Status and Rank

  • State Status: SC
  • State Rank: S2S3
  • Global Rank: G5?

Occurrences

County NameNumber of OccurrencesYear Last Observed
Allegan11983
Charlevoix11964
Cheboygan11971
Clinton11893
Emmet11971
Houghton22006
Ingham11893
Iron11988
Kent11900
Keweenaw11972
Lapeer11964
Menominee12007
Newaygo22006
Schoolcraft21991
Shiawassee11893
Distribution map for Schoenoplectus torreyi

Updated 1/31/2017. 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

Torrey's bulrush is found in seasonally inundated wetlands, including intermittent wetlands and lake margins.

Specific Habitat Needs

Pool needed in Bog

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

Common three-square, lance-leaved violet, arrowhead, one-flowered muhly grass, hardstem and softstem bulrush, strict sedge, and cat tail.

Management

The primary conservation need for this species is the maintenance of hydrology and natural disturbance regime. It may also require prescribed fire over the long-term for perpetuation.

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 May 23, 2017]

References

Survey References

Technical References

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