avalanche lily

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.

1910–15, Americanism; apparently so called because it is found near the snow line or the edge of glaciers

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avalanche lily

perennial herb having large white flowers marked with orange; found near the snow line in the northwestern United States 
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