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Zantedeschia is a genus of twenty-eight species of herbaceous flowering plants in the family Araceae, native to southern Africa from South Africa north to Malawi. The name of the genus was given as a tribute to Italian botanist Giovanni Zantedeschi (1773-1846) by the German botanist Kurt Sprengel (1766 – 1833). Common names include Arum lily for Z. aethiopica, calla, and calla lily for Z. elliottiana and Z. rehmannii although it is neither a true lily (Liliaceae), nor Arum or Calla (related genera in Araceae). It is also often erroneously spelled as “cala lily”.
The Zantedeschia species are very poisonous, capable of killing livestock and children. “All parts of the plant are toxic, and produce irritation and swelling of the mouth and throat, acute vomiting and diarrhea.”
-excerpt from wikipedia