Cypripedium candidum
White lady slipper
Image of Cypripedium candidum

Photo by Bradford S. Slaughter 

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Key Characteristics

Small orchid (20-30 cm) of prairie fens and lakeplain prairies; leaves narrowly elliptic; flower a small ivory-white pouch-like slipper.

Status and Rank

  • State Status: T
  • State Rank: S2
  • Global Rank: G4

Occurrences

County NameNumber of OccurrencesYear Last Observed
Allegan12005
Barry11969
Berrien72007
Branch11970
Calhoun22005
Cass72009
Clinton11884
Genesee11997
Hillsdale52004
Huron11990
Ingham12009
Ionia11884
Jackson82010
Kalamazoo92003
Kent22004
Lenawee32001
Livingston142016
Oakland152008
St. Clair11991
St. Joseph12007
Tuscola21994
Van Buren32005
Washtenaw202016
Distribution map for Cypripedium candidum

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 alkaline wetlands in southern Lower Michigan, particularly prairie fens and occasionally in lakeplain wet and wet-mesic prairies along coastal areas in the Thumb region.

Specific Habitat Needs

Edge needed in Rich tamarack swamp

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

Trees: Larix laricina (tamarack).

Shrubs: Betula pumila (bog birch), Cornus spp. (dogwoods), Dasiphora fruticosa (shrubby cinquefoil), Rhamnus alnifolia (alder-leaved buckthorn), Salix spp. (willows), and Spiraea alba (meadowsweet).

Ground layer: Andropogon gerardii (big bluestem), Arnoglossum plantagineum (prairie Indian-plantain), Calamagrostis canadensis (blue-joint grass), Campanula aparinoides (marsh bellflower), Carex interior (inland sedge), C. sterilis (sterile sedge), C. stricta (tussock sedge), C. tetanica (rigid sedge), Cicuta maculata (water hemlock), Cladium mariscoides (twig-rush), Eleocharis elliptica (golden-seeded spike-rush), Eupatorium perfoliatum (common boneset), Eutrochium maculatum (Joe-pye-weed), Juncus spp. (rushes), Lysimachia quadriflora (whorled loosestrife), Parnassia glauca (grass-of-parnassus), Pilea fontana (bog clearweed), Platanthera leucophaea (prairie fringed-orchid), Pycnanthemum virginianum (Virginia mountain mint), Rudbeckia hirta (black-eyed Susan), Schizachyrium scoparium (little bluestem), Schoenoplectus acutus (hardstem bulrush), S. pungens (three-square), Solidago ohioensis (Ohio goldenrod), S. riddellii (Riddell's goldenrod), Sorghastrum nutans (Indian grass), Sporobolus heterolepis (prairie dropseed), and Thelypteris palustris (marsh fern).

Management

Requires protection of hydrology, groundwater source, and natural disturbance regime. This species benefits from fen management that includes prescribed fire and brush removal, which maintains open habitat and reduces competing woody vegetation. Control/remove invasive species, especially glossy buckthorn and purple loosestrife. Protect habitat from being drained and developed.

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 Dec 18, 2017]

More Information

See MNFI Species Abstract

References

Survey References

Technical References

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