Showy Lady's Slipper
Cypripedium reginae
The Showy Lady's Slipper (Cypripedium reginae) is the queen of North American wildflowers — a magnificent terrestrial orchid in the family Orchidaceae, bearing an enormous white pouch flushed with rose-pink, flanked by elegant white petals and sepals atop tall, leafy stems in northern fens and bogs. Reaching heights of over a meter and producing flowers up to 10 cm across, this is the largest and most spectacular lady's slipper orchid on the continent, and one of the most fiercely protected.
• Cypripedium reginae typically grows 40–100 cm tall (occasionally to 120 cm), producing 1–2 flowers per stem up to 10 cm across from June through July
• The inflated lip (pouch) is white, flushed and veined with rose-pink, 3–5 cm long, flanked by spreading white petals and sepals 5–10 cm long
• The genus Cypripedium comprises approximately 50–58 species distributed across the Northern Hemisphere, with the highest diversity in East Asia
• The species epithet "reginae" means "of the queen" in Latin, a fitting name for what many consider the most beautiful orchid native to North America
• It is the state flower of Minnesota, where it has been protected by state law since 1925
분류학
• Found primarily in the boreal-temperate transition zone, from sea level in the north to approximately 600 meters in the southern Appalachian foothills
• Most abundant in the Great Lakes region, New England, and southeastern Canada, where intact fen and bog habitats remain
• The genus Cypripedium diverged from other orchid lineages during the late Cretaceous to early Tertiary (~70–50 million years ago), making the lady's slippers one of the most ancient surviving orchid groups
• Molecular studies suggest C. reginae is closest to the Eurasian C. calceolus, diverging approximately 5–8 million years ago during the late Miocene
• The species was formally described by Pehr Kalm, a student of Linnaeus, during his travels in eastern North America in 1748–1749 and later published by Linnaeus in Species Plantarum (1753)
• Fossil pollen of Orchidaceae has been recovered from Eocene deposits (~50–45 million years ago), indicating the family's ancient presence in the Americas
Root System:
• Dense cluster of fleshy, fibrous roots emerging from a short, stout rhizome — roots 1–3 mm in diameter, extending 15–25 cm into the substrate
• Roots form mycorrhizal associations with Tulasnella fungi (Basidiomycota), essential for seed germination and nutrient uptake
• Rhizome is horizontal, creeping, producing one aerial stem per growth bud annually
Stems & Habit:
• Stems erect, stout, 40–100 cm tall, densely covered with soft, sticky glandular hairs
• Glandular pubescence gives the stem a sticky texture and musky-sweet odor
• A single stem arises from the rhizome each year
Leaves:
• 3–6 leaves per stem, broadly elliptic to ovate, 10–25 cm long and 5–12 cm wide, prominently parallel-veined
• Pubescent, bright green, clasping the stem at their base with overlapping sheaths
• Prominent cross-venulation visible between parallel veins when held to light
Flowers:
• 1–2 (rarely 3) flowers per stem, exceptionally large, up to 10 cm across
• The lip (labellum) is an inflated pouch, white flushed with rose-pink veining, 3–5 cm long — functioning as a trap for pollinators
• Lateral petals white, lanceolate, 5–10 cm long, often twisted or wavy at the margins
• Dorsal sepal broad, hood-like, white to pale green, 4–6 cm long; two lateral sepals united into a synsepal behind the lip
• Column bears two fertile anthers and a shield-like staminode; faint sweet fragrance detectable in warm conditions
• Bloom period: June–July, individual flowers lasting 5–10 days
Fruit & Seeds:
• Large, pendant, ribbed capsule, 3–5 cm long, containing tens of thousands of microscopic seeds (~0.3–0.5 mm)
• Seeds lack endosperm and require specific mycorrhizal fungi to germinate, a process taking 2–5 years
Habitat:
• Fens, bogs, wet meadows, cedar swamps, and streambanks on neutral to alkaline, humus-rich soils
• Most characteristic of calcareous fens with constant cold, mineral-rich groundwater flow
• Associates with Sphagnum mosses, sedges (Carex spp.), Larix laricina, Thuja occidentalis, and Myrica gale
• Requires cool root temperatures (10–18°C) maintained by groundwater flow
Pollination:
• Primarily pollinated by bumblebee queens (Bombus terricola, B. vagans, B. impatiens)
• The inflated lip traps bees; they must squeeze through a narrow exit passage, collecting pollen on their thorax
• Fewer than 10% of flowers set fruit in the wild due to the rarity of effective pollination events
Adaptations:
• Glandular stem hairs contain a potent irritant causing contact dermatitis similar to poison ivy — a chemical defense against herbivory
• Mycorrhizal dependency enables germination in nutrient-poor peat substrates without seed endosperm
• Cold groundwater maintains root temperatures within the narrow range required for growth
• Listed as Globally Vulnerable (G3) by NatureServe; endangered or threatened in most U.S. states where it occurs
• The state flower of Minnesota, protected under state law since 1925 — one of the earliest legal protections for any North American wildflower
• Primary threats: fen drainage, illegal collection, deer browsing, and wetland succession
• All Cypripedium species are listed on Appendix II of CITES, regulating international trade
• Recovery is extremely slow due to the 15+ years required from seed to flowering size
Light:
• Full sun to partial shade; morning sun with afternoon shade is ideal in warmer climates
• Requires 4–6 hours of direct sunlight for robust growth and flowering
Soil:
• Consistently moist to wet, humus-rich, neutral to alkaline substrates (pH 6.5–8.0)
• Ideal mix: equal parts mucky peat, coarse sand, and well-decomposed leaf mold; add dolomitic limestone at 1–2 tablespoons per gallon
• Roots must never dry out but must never sit in stagnant, anaerobic water
Watering:
• Consistently moist during the growing season; never allow soil to dry out
• Use rainwater or distilled water; avoid hard municipal water high in dissolved salts
• Reduce watering in autumn after foliage dies back, but do not allow rhizome to desiccate
Temperature:
• Hardy to USDA Zones 2–7; requires 3–4 months of winter dormancy at 0–5°C
• Critical: root zone must remain below 18°C during growing season — limits cultivation in warmer zones
Propagation:
• Nursery-propagated plants only — NEVER collect from the wild; wild collection is illegal throughout its range
• Tissue culture (asymbiotic seed germination) is the primary commercial method, taking 5–7 years to produce a flowering-size plant
• Division possible in early spring but risky — each division needs a growth bud and substantial root mass
Common Problems:
• Root rot from warm, waterlogged, or anaerobic conditions — the most common cause of failure
• Deer and slug predation on shoots and buds — fencing and barriers essential
• Failure in soils that are too acidic, warm, dry, or insufficiently organic
• Prized by orchid collectors for its extraordinary beauty; availability limited to nursery-propagated specimens from specialist growers
• Research subject for mycorrhizal specificity, pollination biology, and plant-derived contact allergens
• Featured on a 28-cent U.S. postage stamp in 1984 as part of the "Wildflower" series
• The genus name Cypripedium derives from Greek "Kypris" (Aphrodite) and "pedilon" (slipper) — literally "Aphrodite's slipper"
재미있는 사실
The Showy Lady's Slipper is surrounded by one of the most dramatic conservation stories in North American botany — and by a hidden chemical defense that makes it one of the few orchids capable of fighting back against those who touch it. • The glandular hairs contain a potent contact irritant related to urushiol — the same compound in poison ivy — causing a painful, blistering rash lasting 1–2 weeks. This irony, that North America's most beautiful wildflower can inflict a poison-ivy-like rash, has earned it the nickname "moccasin flower" in some regions • A single plant can live 50–100 years in the wild, yet may take 15–17 years from seed to first flower — meaning a plant blooming today may have germinated before the smartphone era, and its seeds will not flower until the 2040s • Each capsule contains 10,000–50,000 dust-like seeds (~0.3 mm), yet fewer than 0.01% will germinate and survive — an astronomical failure rate that makes the species dependent on stable, undisturbed habitats where adults produce seeds over decades • Minnesota's 1925 protection law was one of the first state-level plant protection laws in U.S. history, passed after decades of commercial collecting had decimated populations near cities — a century later, some populations have still not recovered • The pollination mechanism is an evolutionary masterwork: a bumblebee queen enters the pouch attracted by fragrance, cannot exit the same way, and must push through a narrow tunnel — depositing pollen from a previous visit on the stigma, then collecting a new load from the anther. Fewer than 10% of flowers are successfully pollinated each year
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