Isoetes engelmannii
Engelmann's quilwort

Key Characteristics

Aquatic emergent quillwort (60 cm) of shallow acidic lakes; plants tufted and grasslike with onion-like leaves, swollen at base; sporangia borne in basal cavity of leaf.

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G4

Occurrences

County NameNumber of OccurrencesYear Last Observed
Allegan11989
Distribution map for Isoetes engelmannii

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

This species is found in Intermittent wetlands and soft water lakes in lakeplain landscapes.

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.

Feel free to send questions and comments to Brad Slaughter at slaugh14@msu.edu.

Associated Plants

Robbins spikerush, yellow pond-lily, waterthread pondweed, strict sedge, water smartweed, bluejoint grass, rush, grass-leaved arrowhead,and bulrush.

Management

Quillworts require conservation and protection of hydrology of intermittent wetlands. They are especially vulnerable to ORVs which have caused damage within Michigan's sole site for this species.

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 1, 2017]

References

Survey References

Technical References

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