Cypripedium candidum Willd. - White Lady's Slipper


 

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Cypripedium candidum - (image 1 of 8)

 

Taxonomy

Family: Orchidaceae

Habitat

Calcareous prairies and fens. Some populations have been shown to benefit from burn management and brush clearing.

Associates

In fens with Circium muticum, Gentiana procura, Lobelia kalmii, Parnassia glauca, Potentilla fruticosa, Spiranthes cernua, Valeriana ciliata. In prairies a consistent associate is Zizia aurea.

Distribution

NY and NJ to OH, ND, NE, and MO.

Morphology

Perennial; stem to 40 cm bearing a few sheathing scales and 3-5 leaves. Leaf blades lanceolate to narrowly elliptic, often overlapping at the base, 8-15 cm, the uppermost smaller, erect, and subtending the flower. Lip white, petals lanceolate, often with one or more spiral twists.      

Notes

Flowers late April to early June

Wetland indicator: Obligate

This is a pretty little orchid. I was searching for bog valerian at the edge of a fen and stumbled across this specimen. Can hybridize with yellow lady's slipper C. calceolus L.

References

Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY

 

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2004