mel|an|tha|ceous «MEHL uhn THAY shuhs», adjective.
belonging to a group of bulbless plants now generally classified in the lily family, including the bellwort and white hellebore.
╂[< New Latin Melanthaceae the family name (< Greek mélās, -anos black + ánthos flower) + English -ous]
Useful english dictionary. 2012.