The Collaborative International Dictionary
Cardamine diphylla
crinkle root \crinkle root\, crinkleroot \crinkleroot\n. a North American herb ( Dentaria diphylla) with pungent scaly or toothed roots; -- called also toothwort.
Syn: pepper root, toothwort, Cardamine diphylla, Dentaria diphylla.
Wikipedia
Cardamine diphylla
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 native to North America.
C. diphylla is a spring woodland plant that is found in most of eastern North America.