atamasco lily
noun
at·a·mas·co lily ˌa-tə-ˈma-(ˌ)skō- 
: any of a genus (Zephyranthes) of American bulbous herbs of the amaryllis family with pink, white, or yellowish flowers
especially : one (Z. atamasco) of the southeastern U.S. with white flowers usually tinged with purple
Word History
Etymology
Virginia Algonquian attamusco
First Known Use
1726, in the meaning defined above