Why it's dangerous
The plant contains saponins which act as irritants to the gastrointestinal system and can affect the nervous system, particularly in cats.
Toxic compound: saponins
Good to know
Dilated pupils are specifically noted as a symptom in cats. The plant can range from a small ornamental to a small tree.
Sources
This page is informational and is not veterinary advice. If your pet has been exposed to something risky, contact your vet or an animal poison control line right away.