Cardamine diphylla (Broadleaf toothwort, Crinkle root, Crinkle-root, Crinkleroot, Pepper root, Twin-leaved Toothwort, Twoleaf toothwort, Toothwort; syn. Dentaria diphylla Michx., Dentaria incisa Small) is a plant is native to North America.
C. diphylla is a spring woodland plant that is found in most of eastern North America. It's habitat ranges from Georgia north to Ontario and from the Atlantic to Wisconsin. It is found in moist woodlands usually in edge habitats and blooms from April to June. A member of the mustard family, it is typified by a four petal flower which blooms in a cluster on a single stalk above a single pair of toothed stem leaves each divided into three broad leaflets. After flowering, narrow seedpods appear just below the flower cluster. It grows approximately 30 cm (12 in) tall.
The West Virginia White Butterfly (Pieris virginiensis) lays its eggs on this plant as well as C. laciniata. The larvae also feed on this plant.