Cardamine pensylvanica Muhl. ex Willd.
Family: Brassicaceae
Pennsylvania bitter-cress
Cardamine pensylvanica image
Josh Sulman  
Etymology: Cardamine: originally from the Greek kardamon used by Dioscorides for some cress, maybe used in treating heart ailments
Plants: erect or spreading, annual/biennial, 6"-24" tall forb; stems often hairy toward the base
Leaves: pinnately-divided into long, thin leaflets with the end leaflet largest
Flowers: white, 4-parted; inflorescence a loose cluster (raceme) of stalked flowers; blooms April-June
Fruits: long, thin, erect pods
Habitat: wet; woods, streambanks, swamps
Conservation Status: Native