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The substance that causes the problem for people is an oily compound called urushiol, found in many cells of the poison ivy vine.

Mr. Davidson is 6-foot-3 and built like an ivy vine, slender and bendy.

The only thing that did well was a poison ivy vine – thick around as my wrist – which slowly tried to pull down the fence that separated my yard from the construction site next door.

There is something immensely satisfying about getting an ivy vine and pulling it out by the roots.

Clearly, that seemed to be the case for a teenager at a mall recently, with his lips ardently attached to, of all things, the knee of his girlfriend; or for the man on a busy corner an hour later, passionately kissing a woman while wrapping his leg around her like an ivy vine.