Centaurium pulchellum

Family: Gentianaceae 
Common Names: Branched Centaury 

Introduced to USA: CO, CT, DE, IA, IL, LA, MA, MD, ME, MI, MN, MS, NE, NJ, NY, OH, PA, SD, TX, VA VT, WI, WY     
Introduce to Canada: NB, NS, ON, QC