Poison Ivy, Toxicodendron radicans, and look-alikes. Nearly everyone in our part of the world is familiar with the effects of Poison Ivy, colorfully described as "a highly disagreeable cutaneous eruption, attended with violent itching," by the 1891 edition of the Encyclopaedia Britannica. Many people know it has three leaves thanks to the mnemonic rhyme "Leaves of three, let it be." We hope this gallery will help you correctly identify Poison Ivy, but the most important thing to remember is…
