Cypripedium candidum
| Small white lady's slipper | |
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| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Cypripedioideae |
| Genus: | Cypripedium |
| Species: | C. candidum |
| Binomial name | |
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Cypripedium candidum Muhl. ex Willd. |
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| Synonyms | |
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Calceolus candidus (Muhl. ex Willd.) Nieuwl. |
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Calceolus candidus (Muhl. ex Willd.) Nieuwl.
Cypripedium candidum, also known as small white lady's slipper or white lady's slipper, is a rare orchid of the Cypripedium genus.
Cypripedium candidum is found from Western New York, across southern Ontario to North Dakota, and south to New Jersey and Missouri. There are isolated populations of Cypripedium candidum in Connecticut, MarylandManitoba, Virginia, Alabama, and (formerly) Saskatchewan. It is found in wet prairies and fens, in rich, highly calcareous soils, sedge meadow edges, calcareous roadside and railway ditches.
Cypripedium candidum grows to a height of 10 to 40 cm, and blooms from early May to June. Its white pouch-like lip, sometimes dotted with maroon on the inside, is accented by tan, green or brown lateral sepals and petals. It has been known to hybridize with the small yellow ladyslipper, C. parviflorum var. makasin, resulting in the natural hybrid Cypripedium × andrewsii. The leaves and stems are slightly pubescent. The plants grow in (generally) long-lived clumps, with some clumps having up to 50 or more flowers.
Cypripedium candidum is considered rare across Canada, endangered in Ontario, and protected under the Ontario Endangered Species Act. It is believed to be extirpated from Saskatchewan. It is threatened in the United States, extirpated from Pennsylvania, endangered in South Dakota and Wisconsin, threatened in Illinois, Kentucky, and Michigan, and rare in Missouri and North Dakota. It is listed in Canada as N2, or endangered. Globally, however, it is listed as G4 (apparently secure) because there are protected sites across its entire range. It is a perennial, with horizontal, wiry-rooted rhizomes growing a few centimeters below the surface of the soil, and hence resistant to most prairie fires. It is shade-intolerant and therefore requires substantial management for invasive and woody species.
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