Spider lilies (Lycoris species) belong to the Amaryllidaceae family, which is different from true lilies (Lilium species) but are also considered toxic to cats. While true lilies such as Asiatic, Easter, and daylilies cause severe kidney failure in cats, spider lilies are also poisonous but typically cause toxicity through different mechanisms. If ingested by cats, spider lilies can cause symptoms such as vomiting, diarrhea, and potentially severe cardiac issues, including a drop in heart rate or arrhythmia. Even exposure to pollen is less problematic than with true lilies, but ingestion of any part of the spider lily plant should be avoided to prevent poisoning in cats.
Thus, spider lilies are poisonous to cats and should be kept away from them to avoid health risks.