Epioblasma torulosa, commonly called the tubercled blossom, is a species of freshwater mussel, a mollusk in the family Unionidae.

It is native to eastern North America, where it is considered endangered in both Canada and the United States.

The US Fish and Wildlife Service declared the Green and Tubercled blossom subspecies extinct and delisted it from the Endangered Species Act on October 16, 2023.

It is found in shallow riffle zones over sand and gravel in large to medium-sized rivers.

It is unclear whether this is best understood as ecophenotypic variation, various subspecies, or a complex of closely related but genetically isolated species.