These ridges of blisters are characteristic of both poison ivy and poison oak rashes, and are a sure sign that you've wandered through a patch of the toxic plants. Contrary to popular belief, breaking the blisters will not spread the dermatitis. Both species produce a deceptively attractive lush green growth.
PHOTO: SANDRA DARK
Poison oak is a shrubby ground plant that favors shaded woodland areas.
Learn to recognize the plants by their alternate leaves with three leaflets per frond and you won't mistake the inoffensive five-leaved Virginia creeper vine for its dangerous neighbors
Poison ivy vines tend to climb trees or other upright supports.