watershield (Brasenia schreberi)

Brasenia schreberi is accepted species in  the family Cabombaceae   
Genus Brasenia 
Infraspecific taxa recognized within : infraspecific taxa
This species is found in Alabama, Alaska, Alberta, Amur, Angola, Arkansas, Assam, Bangladesh, Belize, Botswana, British Columbia, Burundi, California, Cameroon, China South-Central, China Southeast, Connecticut, Cuba, Delaware, District of Columbia, Dominican Republic, El Salvador, Ethiopia, Florida, Georgia, Guatemala, Guyana, Idaho, Illinois, India, Indiana, Iowa, Jamaica, Japan, Kansas, Kentucky, Kenya, Korea, Louisiana, Maine, Manitoba, Maryland, Massachusetts, Mexico Gulf, Mexico Northeast, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, New Brunswick, New Hampshire, New Jersey, New South Wales, New York, Newfoundland, Nigeria, North Carolina, Northern Provinces, Nova Scotia, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Primorye, Queensland, Québec, Rhode I., South Carolina, Taiwan, Tanzania, Tennessee, Texas, Uganda, Venezuela, Vermont, Victoria, Virginia, Washington, West Virginia, Wisconsin, Zambia, Zaïre, Zimbabwe.