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Toxicodendron radicans

Poison-ivy berries.

Poison-ivy growing in no-till corn.

Poison-ivy flowers.

  • '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.