any of several plants (genus Narthecium) of the lily family found in bogs, esp. a grasslike wildflower (N. americanum) native to New Jersey that has yellow blossoms
See bog asphodel in American Heritage Dictionary 4
or bog-as·pho·del
noun
Any of several perennial herbs of the genus Narthecium in the lily family, native to boggy areas in northern temperate regions and having grasslike leaves and clusters of yellow flowers.