'Toxicodendron' is Greek meaning 'poison tree'.
'Leaflets three, let it be -- berries white, poisonous site.'
Each year, reactions to poison-ivy are one of the most often cited causes of workers' compensation claims.
Application of crushed leaves of jewelweed (Impatiens capensis) relieved the effects of recent exposure to poison-ivy in 108 out of 114 people tested.
Contrary to a widely-held belief, eating a poison-ivy leaf will not result in immunity to its toxin.
Botanists have contracted dermatitis from handling 100-year-old dried plants.
Poison-ivy has been cultivated in gardens and sold as an ornamental in Europe and Australia.
In the Netherlands, where its attractive fall foliage is prized, it is planted along dikes.