cardamine diphylla(n = noun.plant) crinkle root, crinkle-root, crinkleroot, dentaria diphylla, pepper root, toothwort - North American herb with pungent scaly or toothed roots;
is a kind of bitter cress, bittercress

cardamine, cardamine bulbifera, cardamine bulbosa, cardamine douglasii, cardamine pratensis, cardamine rotundifolia, dentaria diphylla, diphylla, diphylla ecaudata, genus cardamine, genus diphylla, mitella diphylla