Environmental experts started warning people to be careful around the dangerous plant known as the Giant Hogweed Giant Hogweed is a public health hazard that ranks up there higher than poison ivy, poison oak and poison sumac in respect to its potential to harm humans. (ocgov.net)
You'll know poison sumac as a rangy shrub, with smooth - edged green leaves with red stems. (health.com)
This rash, known as contact dermatitis or rhus dermatitis, is actually an allergic reaction to the urushiol oil (which is found in poison ivy, poison oak, and poison sumac plants) produced by the toxic vine. (health.com)