When I have to remove it, I cover my arms and face with soap lather and let it dry. Then I put on long sleeves and pants.I don't know how to get rid of it. It looks like it's growing out of the stem or root of this bush that we have.
I slip a bag big enough to encase the plant and tie it tight at the base. Then dig out the plant. By the roots. Rake up all debris and dispose of it.
The seeds can be spread by birds that eat them.