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Poison oak. Poison oak also secretes an oily sap called urushiol (pronounced yoo-Roo-shee-all) on its stems and leaves which can cause an allergic reaction. If you don’t have a reaction the first time ...

Western poison ivy (Toxicodendron rydbergii) and western poison oak (Toxicodendron diversilobum) are native to California, although poison oak is far more prevalent.

Poison oak's leaves resemble an oak leaf, but at times have jagged edges, according to the Santa Lucia Conservancy, based in Carmel, California. Like poison ivy, its leaves have a alternate leaf ...

Poison oak is a relative to poison ivy that contains the same oils and is extremely common in California. There are two types of poison oak plants, Pacific poison oak and Atlantic poison oak.

Poison ivy, oak and sumac all can create itchy rashes from urushiol. What you need to know before the rash starts.

A former hotshot firefighter, Jordan Thomas was there in California in 2021 when the disastrous fires hit. In "When It All Burns," he describes what he saw and how it affected his coworkers.

Just thinking about poison ivy can make you itch. Blistering rashes on your arms and ankles, oozing bumps between your fingers and eyelid-swelling exposures are all-too-familiar summer hazards.

Poodle-dog bush thrives in Southern California mountains after wildfires. It's pretty but petting it can result in a severe skin rash, making it a bane of hikers.