Cow Parsnip gave me burns like I've never had before. 5 weeks of pain and horrible itching.
There's nothing you can do about it once it is on you. The burns are photosensitive.
Parsnip family all reacts the same... giant hogweed, cow parsnip, and others
https://www.adn.com/adventure/outdoors/2016/06/16/hikers-beware-cow-parsnip-can-inflict-pain-on-those-who-dont-take-precautions/