PROTECTING WISCONSIN'S BIODIVERSITY

 
 
   
 
Scientific Name Common Name Global Rank State Rank Federal Status WI Status

Calypso Orchid (Calypso bulbosa)

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Photo by Thomas Meyer

 

Counties with Mapped NHI Occurrences

Calypso Orchid (Calypso bulbosa), a Wisconsin Threatened plant, is found only in old-growth white cedar swamps. Blooming occurs early-May through July, fruiting late-June through late-July. The optimal identification period for this species is late-May through early-June.

Calypso bulbosa var. americana, Cytherea bulbosa

 
 
 

Calypso orchid a very small (10-20cm) orchid bearing a solitary flower with pale purple to white, lance-shaped petals above, a pinkish-white pouch-shaped petal covered in dark red stripes below and a white lip with a clump of yellow hairs protruding from it. Its fruit is an erect, cylindrical to lanceoloid, ribbed capsule that is 2-3cm long. It has a single, 3-5cm long, round to egg-shaped, often notched at the base leaf with a petiole that is usually 3-5cm long.

Blooming occurs early-May through July, fruiting late-June through late-July.

Perennial. The optimal identification period for this species is late-May through early-June.

Associated species include Thuja occidentalis, Coptis trifolia, Polygala pauciflora, Linnaea borealis, Cornus canadensis, Mitella nuda, Gaultheria hispidula, Platanthera obtusata, Carex disperma, and C trisperma.

Calypso orchid prefers moist soils and is found only in old-growth white cedar swamps.

Avoid broadcast spraying of herbicides and use care with spot spraying.

This species overwinters above ground, meaning that seasonal restrictions like conducting the a project on frozen ground will not result in avoidance. Therefore, known individual plant locations should be avoided year-round. Consult with a biologist, if needed.

Follow BMPs, especially around streams and use care near ravines, steep slopes, cliffs, rock outcrops, etc.

This species requires shaded habitat conditions, maintain high forest canopy cover.

Minimize disturbance to hydrology, including soil disturbance from rutting.

Avoid rapid and dramatic reductions in canopy cover and, basal area, in wet areas to reduce risk of swamping.

Species of Greatest Conservation Need (SGCN) are associated with habitats (or natural communities) and places on the landscape. Understanding relationships among SGCN, natural communities and ecological landscapes help us make decisions about issues affecting SGCN and their habitat and how to respond. Download the Wildlife Action Plan association score spreadsheet to explore rare species, natural communities and ecological landscape associations

Conservation actions respond to issues or threats, which adversely affect species of greatest conservation need (SGCN) or their habitats. Besides actions such as restoring wetlands or planting resilient tree species in northern communities, research, surveys and monitoring are also among conservation actions described in the Wisconsin Wildlife Action Plan because lack of information can threaten our ability to successfully preserve and care for natural resources.