Erythronium americanum

Erythronium americanum Ker-Gawl.
Engl.: adder's tongue, dogtooth violet, amberbell, American adder's tongue, dog's tooth violet, erythronium, fellow snowdrop, lamb's tongue, rattlesnake violet, scrofula root, serpent's tongue, snake leaf, trout-lily, yellow erythronium, yellow snakeleaf, yellow snowdrop.