avalanche lily

noun
  1. either of two plants, Erythronium grandiflorum or E. montanum, of the lily family, of the mountains of northwestern North America, having nodding yellow or white flowers.

Origin of avalanche lily

An Americanism dating back to 1910–15; apparently so called because it is found near the snow line or the edge of glaciers
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018