Adder's Tongue is the name for Erythronium that Palmer uses, and I appreciate its mythopoetic nature. However, this appellation is confusing: for Gerarde and other medieval authors, Adder's Tongue is a fern, while the more common American name, 'Dogtooth Violet' is also problematic – the plant is a lily, not a violet. For accuracy, we're left with 'Trout Lily', which, thought not as tuneful, describes well the mottled oval leaves that indicate the plant’s presence long before its flowering.