Oleander (Nerium oleander) is a common ornamental evergreen shrub. It is used as a freeway median divider in warmer states, such as California. This plant is extremely toxic, and a single leaf may kill an adult. This photograph shows oleander not yet in bloom.
Review Date 11/13/2021
Updated by: Jesse Borke, MD, CPE, FAAEM, FACEP, Attending Physician at Kaiser Permanente, Orange County, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.