Toxic or Not?
Did I catch anyone? Easter Lilies and Stargazer Lilies, actually all members of the Lilium family, when ingested in any quantity, will cause kidney failure in cats. The toxic principal is unknown at this time, although all parts – leaves, flowers, etc. – are considered poisonous.
The third photo is a Peace Lily (Spathiphyllum) and is not really a lily at all. It does contain calcium oxalate crystals, which can cause oral irritation, including a burning sensation in the mouth, excessive drooling or vomiting, but isn’t fatal.
The take-home lesson here is to know what kind of plants you have in your home and gardens. If you don’t know the name of the plant, it does no good at all to call your vet and say “Fluffy just ate a big green leaf. Is it poisonous?” A scientific name is best, but at least a common name is essential if you want a straight answer. A good source for information about toxic plants is the ASPCA's Animal Poison Control Center.
Those are Stargazer Lilies among the roses and greenery. I thanked her very politely, and took the arrangement to my mom’s feline-free condo, where no munching cats could reach it. Just say “No” to lilies if you are a cat owner.