I'm pretty sure a native dandelion. Have to check back with this one.
I think this is what it is according to the key I'm looking at. Native range is Europe.
I've been seeing these at my mom's and I thought these were one of her ornamental flowers for a while.
However when I walked in a nearby forest with white snakeroot as the understory I've been seeing darker shades of purple in the emerging leaves, not as dark as these.
I looked it up and saw on Mt. Cuba's website a dark occurring variety of white snakeroot. It's called "chocolate" on the website and was the darkest occurring from seeds grown within a 10 year period.