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Trillium cernuum is accepted species in  the family Melanthiaceae  subfamily: Parideae,  
Genus Trillium 
This species is found in Connecticut, Delaware, District of Columbia, Illinois, Indiana, Iowa, Maine, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, North Dakota, Nova Scotia, Ohio, Ontario, Pennsylvania, Prince Edward I., Québec, Rhode I., Saskatchewan, South Dakota, Vermont, Virginia, West Virginia, Wisconsin.
Trillium cernuum f. lalondei Fungus Guy
Trillium cernuum Arx Fortis
Trillium cernuum Fungus Guy
Trillium cernuum Hardyplants
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