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Cypripedium reginae Walter

Showy lady’s slipper

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassLiliopsidaMonocots (plants with a single seed leaf); includes the lily family
SubclassLiliidaeIncludes lilies, orchids, and many others
OrderAsparagalesA diverse group that includes asparagus
FamilyOrchidaceaeOrchid family
GenusCypripediumLatinization (albeit an incorrect one) of ancient Greek words meaning “Venus’ shoe”

About plant names...

Showy lady’s slipper is a rare North American native orchid. It prefers neutral or alkaline soils, and wetlands such as fens, wooded swamps, forests, and riverbanks, usually in partial shade. It grows slowly, taking as long as 16 years to produce its first blooms. From Wikipedia: “The plant is classified as imperiled or critically imperiled in Arkansas, Connecticut, Illinois, Iowa, Missouri, New Brunswick, New Hampshire, New Jer­sey, Newfoundland & Labrador, North Dakota, Nova Scotia, Ohio, Pennsylvania, Prince Edward Island, Saskatchewan, Tennessee, Virginia and West Vir­ginia. It is considered vul­ner­able in Indiana, Maine, Mani­toba, Massachusetts, New York, Quebec, Vermont, Wiscon­sin, Rhode Island, and sev­eral areas of eastern Canada. It is known to occur in only 14 locations in Massachusetts (as of 2016). It was historically found in Kentucky and North Carolina, but has not been found recently.”

Plants: Plants are 8-35″ (21-90 cm) high. Many stems—rarely up to 200—emerge from the same root mass.

Leaves: Each stem has 3-6 (rarely up to 9) alternate, pubescent (hairy) leaves. Each leaf is ovate, with parallel, deeply ribbed veins, 4-11″ (10-27 cm) × 1¾-6″ (5-16 cm). Stems and leaves are covered with thin hairs that can cause mild to severe dermatitis.

Flowers: Each stem supports up to three white-topped, pink-pouched flowers. The upper white petals and sepals form a roughly flat top. Each petal is up to 1½″ (4 cm) long × ½″ (1.5 cm). The pouch-shaped lip, or labellum, is rose-pink to magenta, and ⅞-2″ (2.5-5.5 cm) long. These are distinguished from pink lady’s slipper (Cypripedium acaule) because showy lady’s slipper is large—flowers are up to 4″ (10 cm) across—and pink lady’s slipper has no white petals on top.

Online References:



The U.S. Forest Service Celebrating Wildflowers site




Cypripedium reginae description by Thomas H. Kent, last updated 16 Dec 2020.

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Cypripedium reginae (showy lady’s slipper)

Preserved by the Nature Conservancy in Hartland, VT, USA · 6/17/2011 · Hartland, Ver­mont · By Susan Cole Kelly


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