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The alstromeria lilly or peruv***** *****lly is in the tulipa plant family. These types of lillies cause stomach upset, potential vomiting and diarrhea, and sometimes irritation in the mouth for cats, but not the deadly kidney damage that true lillies are known for.
It would be wise to monitor Oscar for the next 24 hours, possibly feed him a bland diet, and look out for any GI upset. If he does start vomiting, you may want to withhold food and water to ensure his stomach has a chance to settle down.