Unknown flower

Unknown flower

Observation - Unknown flower - Global. Description: I suspect that this is a garden plant gone wild , but given that it its found niches that I cant dig it out from, it out competes anything I plant, and it's spread up and down the street: I'd like a name for it.

I suspect that this is a garden plant gone wild , but given that it its found niches that I cant dig it out from, it out competes anything I plant, and it's spread up and down the street: I'd like a name for it.