One of the identification points of Hairy Bittercress is that the stem is smooth … no hairs! The only hairs on the plant are a few short ones on the base of the leaf stems. I find it interesting that botanists are so worked up about hairs on plants that whenever they find just a few on a plant, they name a whole new species after it. 🙂 I’m sure that there is a whole web page out there that discusses the role of hairs on plants.
Hairy Bittercress is a European plant that grows in disturbed areas around Indiana. Most people would consider it a weed. Even the wild edibles people consider it a bitter plant to eat, although I’m sure that it’s chock full of vitamins.
I haven’t found it particularly invasive or noxious, since it tends to grow along gravel drives and other places where native plants don’t do so well anyway.