Stinging Nettle

You can't forget this plain looking plant if you have the misfortune of touching the leaves or stems. The very aptly named Stinging Nettle (Urtica dioica) thrives in moist areas along streams, in thickets, and can quickly take over an open area like the road shown below. The tiny blossoms are non-descript, greenish blobs. The stinging comes from formic acid in the tiny hairs that penetrate the skin and break. The burning sensation is almost immediate and can last 24 hours (and yes, I know this from personal experience!).

This forest of nettles is located along the bike trail that goes from the east end of Champoeg State Park up to the Butteville store. Bikers beware! (6/15/2013). I scanned several web sites for nettle treatment. This one had several choices and made me want to pack baking soda for my next hike: http://www.wikihow.com/Treat-a-Sting-from-a-Stinging-Nettle

The origin of this plant is unknown, although Eurasia is likely.