Poison Ivy Yellow. The autumn brilliance of poison ivy's foliage is due to the anthocyanin pigments characteristic of the plant family to which poison ivy belongs. Poison ivy, poison oak, and poison sumac are plants that contain an irritating, oily sap called urushiol.
The most common type of poison oak, known as western poison oak, grows most commonly along the Pacific coast in Oregon, Washington, and California.
But they're not the only plants that can irritate your skin.
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This rash, known as contact dermatitis or rhus dermatitis, is actually. Poison ivy grows as a shrub or vine in woods, fields, and areas of thick underbrush. Poison ivy, poison oak, and poison sumac are a hazard year-round.