What is the name of this flower(or weed)?

Question

Located Central New York. Covers roadsides and fields in it pinkish purplish color. 5 shredded like petals and about 3 blossoms per stem.

http://www.artwanted.com/imageview.cfm?ID=673211&SubGal=Floral

Answer 1

It's called ragged robin:  http://plants.usda.gov/java/profile?symb...