Botrychium simplex is accepted species in  the family Ophioglossaceae  subfamily: Botrychioideae,  
Genus Botrychium 
This species is found in Alaska, Alberta, Austria, Baltic States, Belgium, British Columbia, California, Central European Rus, Colorado, Connecticut, Corse, Delaware, Denmark, East Himalaya, Finland, France, Germany, Greece, Greenland, Iceland, Idaho, Illinois, Indiana, Iowa, Italy, Japan, Korea, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Montana, Nepal, Nevada, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, North Carolina, North Dakota, North European Russi, Northwest Territorie, Norway, Nova Scotia, Ohio, Ontario, Oregon, Pennsylvania, Prince Edward I., Québec, Rhode I., Saskatchewan, South Dakota, Sweden, Switzerland, Tibet, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yugoslavia.