Name this weed!

[Pat B]

If it is the plant I'm thinking it has fleshy leaves and stem and has a distinct odor when you crush the leaves. I don't think it's a thistle.

[Hud]

Looks like a thistle. You could call your local Dept of Agriculture or send them a picture. A surprising number of plants are invasive and poisonous to animals. The fact that is coming up around your area is not good. Would not scatter the seed pods until you find out.
http://www.invasive.org/species/list.cfm?id=21

[dirtguy]

Honestly guys the name of the plant is pilewort. Google it and see.