Native to eastern North America, this member of the Lily family is one of the treasures of the spring woodland garden.  Because the drooping flowers resemble the uvula (that funny looking, flapping thing at the back of the throat), it was thought to be good for treating diseases of the throat.  Whether or not that worked out, I don't know.  I do know that this native wildflower is one of the best, growing from 18 to 24 inches high, with gray/green foliage and large, lemon yellow drooping bells.  Uvularia grandiflora forms colonies in partial shade and in rich, moist (but well-drained) soil.  It blooms in late spring, and I expect a colony of these wildflowers would be quite the show.  Zones 2-9.