Lepidium virginicum

Family: Brassicaceae
Common Names: Virginia Peppergrass, Virginia Pepperweed, Peppergrass, Poor Man's Pepper 

Native to USA: 48 Contiguous States + PR
Introduced to USA: AK, HI, + VI
Native to Canada: BC, NB, NF, NS, ON, PE, QC 

Additional Resources:
Flora of North America