I'm talking about poison ivy, of course... I'm generally not effected by poison ivy, and don't generally give it much thought. I do a lot of outdoor work, in short sleeves and no gloves to the horror of my wife and neighbors constantly shrieking 'Don't touch that, it's poison ivy!' Except it's not. I pick up a vine and show them that this mystery weed has leaves of five, not three, and therefore it isn't poison ivy. They all think I'm insane and flirting with death. This includes people who've lived in this area all their lives and claim to know the local fauna. Anybody have an idea what this weed is? As much as the reputation for insanity works in my favor, I'd like to be able to show these people that I know what I'm talking about. It grows as a vine, with a reddish non-hairy stem when it's young, somewhat woody when it's older. It climbs up trees, fences, and the sides of buildings. The leaves are dark green, I've never seen flowers or berries, but the edges of the leaves have a slight serration, and as I mentioned, always grow in groups of five.