Amerorchis rotundifolia
Small round-leaved orchis
Image of Amerorchis rotundifolia

Photo by Bradford S. Slaughter 

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Key Characteristics

Small circumboreal orchid (10-25 cm) of cedar swamps bearing a single oval, basal leaf; flowers pale pink to white on a single tall stalk, with lower lip spotted with dark purple.

Status and Rank

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

Occurrences

County NameNumber of OccurrencesYear Last Observed
Chippewa12013
Delta12015
Dickinson11883
Emmet21981
Keweenaw21981
Marquette11891
Menominee11968
Oscoda11990
Schoolcraft12015
Distribution map for Amerorchis rotundifolia

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 cold northern swamps, semi-open fens, and large peatland complexes.

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

Sphagnum moss, sedges, leatherleaf, bog rosemary, wild calla, round leaved sundew, cotton grass, swamp-laurel, large cranberry, small cranberry, three-leaved false Solomon's seal, yellow lady's slipper, showy lady's slipper, Labrador tea, heart-leaved twayblade, and blunt-leaf orchid, marsh fern, pitcher-plant, bog birch, northern white cedar, black spruce, and balsam fir.

Management

Requires protection of habitat. This includes the maintenance of the overstory and ensuring a continuous cool groundwater supply to maintain microsite conditions.

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 Sep 22, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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