Many harmful weeds, such as poison ivy and poison oak, contain urushiol, causing rashes and blisters. Weeds like giant hogweed and wild parsnip produce sap that can lead to severe skin burns upon ...

Nothing celebrates the glorious month of May better than the wonderful froth of cow parsley running along miles of British country lanes, often beneath the equally lovely display of white hawthorn, or ...

Add Yahoo as a preferred source to see more of our stories on Google. If you're heading outdoors this summer, it pays to know the difference between poison ivy, poison oak and other rash-producing ...