Several types of lilies can be poisonous to cats including: Easter lily, Tiger lily, Rubrum lily, Japanese show lily, some species of Day lily, and certain other members of the Liliaceae family. All parts of the plant are poisonous and ingesting just one leaf pollen can result in severe poisoning and within a very short time your cat will exhibit signs of toxicity.
All parts of the lily plant are considered toxic to cats, and consuming even small amounts can cause severe poisoning and death. Cats can be affected if they simply brush against the flower and get pollen on there coats. Later they will groom the pollen off and ingest the lily pollen as they clean their fur.