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Dieffenbachia seguine (Jacq.) Schott - Araceae
dumbcane, Dieffenbachie, Giftaron, Schweigrohr
Evergreen perennial, native to Central America, the Caribbean and South America; leaves large, cultivars and hybrids with various shades of yellow and green and variegated patterns.
http://en.wikipedia.org/wiki/Dieffenbachia_seguine
„Dieffenbachia may well be the most toxic genus in the Araceae. Calcium oxalate crystals, a protein and a nitrogen-free compound have been implicated in the toxicity, but the available evidence is unclear. The plants have also been used as food, medicine, stimulants, and to inflict punishment.“
[Dieffenbachia: Uses, abuses and toxic constituents: A review. Arditti, J., Rodriguez, E., Journal of ethnopharmacology, Vol.5(3), 1982, 293-302]