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A poison wearing a flower's smile, equally happy to season your pie or kill your worms.

means A bitter, aromatic herb (Tanacetum vulgare) with button-like yellow flowers, historically used in cooking, medicine, and as an insect and worm repellent, though it can be toxic in quantity.

from From Old French 'tanesie' or 'tanaisie', shortened from Late Latin 'athanasia', which traces back to Greek 'athanasia' meaning 'immortality' — from 'a-' (not) plus 'thanatos' (death). The flowers were said to keep for a remarkably long time after cutting, and the herb's preserving, embalming, and worm-killing powers all leaned into that deathless reputation; so the plant that could kill your worms was named, fittingly, after the refusal to die.

medieval embalming
Stuffed into corpses to keep insects and decay away
toxic dose
Thujone in the oil can trigger convulsions, death
easter custom
Eaten in cakes to purge winter's salted diet
button blooms
Yellow flower heads earned it the name bitter buttons
invasive streak
Banned as noxious weed across several U.S. states
for instance

tansy ragwort hybrid — invasive weed in northwest us pacific regions, spreads across millions of acres in oregon and washington

tansy oil remedy — used historically for abortions and parasites in 18th-19th century europe, often caused poisoning deaths

tansy beetle — chrysomela graminis, blue-green metallic insect native to britain, feeds exclusively on tansy plants

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