Cypress Spurge (Euphorbia cyparissias) is a European perennial that was introduced to the United States as an ornamental plant. It is an invasive weed and has spread all over North America invading hay fields, pastures, and roadsides. Cypress Spurge is toxic to cattle causing severe sickness and possibly death. All parts of the plant contain a toxic latex that irritates the eyes, mouth, and gastrointestinal tract. It also causes dermatitis upon contact in some people. This plant was photographed at Ward Pound Ridge Reservation in New York State.