Jack-In-The-Pulpit (Arisaema triphyllum) is one of eastern North America's most unusual and charismatic wildflowers — a plant whose flower resembles a tiny preacher standing in a canopied pulpit, complete with a hooded spathe that arches overhead like a miniature church roof. But beneath this whimsical exterior lies a plant of remarkable biological sophistication: Jack-In-The-Pulpit can change its sex from year to year, switching from male to female as it grows larger and accumulates more energy, and its tissues are loaded with needle-sharp crystals of calcium oxalate that cause intense burning if the plant is consumed raw.
• The flower structure literally looks like a tiny figure ("Jack") standing inside a hooded pulpit — one of nature's most perfect visual metaphors
• Capable of changing sex: small plants produce male flowers, large plants produce female flowers, and the plant can switch back and forth depending on energy reserves
• All parts contain sharp calcium oxalate crystals (raphides) that cause immediate, intense burning and swelling if eaten raw
• Also called "Indian Turnip" because Native Americans rendered the corm edible by prolonged cooking or drying
• The genus name Arisaema means "blood arum" in Greek
• The species epithet "triphyllum" means "three-leaved"
• Found from Nova Scotia and southern Ontario southward to Florida and westward to Texas, Minnesota, and Kansas
• Most abundant in the Appalachian Mountains, the Ohio Valley, and the southeastern states
• Grows in moist deciduous and mixed woodlands, swamp margins, floodplains, and along stream banks
• Found at elevations from sea level to 900 m
• First described by Linnaeus in 1753 as Arum triphyllum, later reclassified to Arisaema
• The genus Arisaema contains approximately 150 to 200 species, mostly in Asia, with only 2 native to eastern North America
Corm:
• Underground storage organ, globose, 2 to 5 cm in diameter
• Contains numerous needle-shaped calcium oxalate crystals (raphides)
Leaves:
• 1 to 2 leaves, each divided into 3 leaflets (hence "triphyllum")
• Leaflets ovate to lanceolate, 8 to 20 cm long and 4 to 10 cm wide
• Dark green, smooth margins or slightly wavy
Stem:
• Single, erect, green to purplish, smooth, bearing the leaf and flower
Flower:
• A spathe-and-spadix structure (typical of the Araceae family)
• Spathe: a hooded, leaf-like bract, 5 to 10 cm long, green to purplish-brown, often striped
• Spadix: a fleshy spike bearing tiny flowers at the base, hidden inside the spathe
• Male flowers on the upper part of spadix; female flowers on the lower part
• Blooms April through June
Fruit:
• Cluster of bright red to orange-red berries on the spadix in late summer
• Each berry 5 to 8 mm in diameter, containing 1 to 5 seeds
• Found in moist, rich deciduous and mixed forests, floodplains, swamp margins, and along stream banks
• Prefers neutral to slightly acidic, humus-rich, moist soils in dappled to deep shade
• Exhibotes sex switching (sequential hermaphroditism): small corms produce male flowers, large corms produce female flowers
• Male plants typically have a small hole at the base of the spathe allowing insects to escape after depositing pollen
• Female plants lack the exit hole, trapping insects inside to ensure thorough pollination
• Pollinated by fungus gnats and small flies attracted to the warmth and faint odor of the spathe
• Bright red berries in late summer are consumed and dispersed by birds
• The corm stores energy from one year to the next, and the plant can remain dormant underground in unfavorable years
• Plant in dappled to full shade in moist, humus-rich, well-drained soil
• Ideal for woodland gardens, shade gardens, and shaded stream margins
• Plant corms in autumn, 8 to 10 cm deep
• Prefers soil that stays consistently moist but not waterlogged
• Tolerates clay soils if well-drained
• Very low maintenance once established — the plant reliably returns each spring
• The red berry cluster in late summer is as ornamental as the flower
• Combine with ferns, hostas, and wild ginger for an exotic woodland garden
• Hardy to USDA Zone 3
Wusstest du schon?
Jack-In-The-Pulpit is one of the few plants in the world that can change its sex from year to year based on how much energy it has stored. A plant with a small corm and limited reserves will produce only male flowers — a relatively cheap investment that allows it to reproduce via pollen without the enormous energy cost of producing seeds. As the corm grows larger through years of photosynthesis, the plant switches to producing female flowers, which require far more energy but produce seed-bearing berries. If a particularly harsh year depletes the corm's reserves, the plant can switch back to male. This remarkable flexibility, called sequential hermaphroditism, is almost unknown in temperate plants and makes Jack-In-The-Pulpit one of the most biologically sophisticated wildflowers in North America.
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