Arabis caucasica Willd.
Family: Brassicaceae
garden rock-cress, gray rock-cress, wall rock-cress
Arabis caucasica image
Emmet J. Judziewicz  
Etymology: Arabis: a Greek word used for "mustard" or "cress," and the Greek word for Arabia, perhaps referring to the ability of these plants to grow in rocky or sandy soils (?)
Plants: perennial forb
Flowers: 4-parted
Conservation Status: Introduced - escaped