Bernice Bjornson had this this to say about Erythronium in 1946:  “Found in the woods in May, sometimes in April, and in the high altitudes in June, the Erythroniums delight the eye with their bright yellow color and their gracefully curving petals.  . . .  This genus is rich in common names and many explanations have been written as to why they have been given. Lamb’s tongue, adder’s tongue, glacier lily, avalanche lily, and dogtooth violet are all used. Choose the one or ones which appeal most to you.”