Engelmann’s adder’s tongue, limestone adder's tongue (Ophioglossum engelmannii)

Ophioglossum engelmannii is a species in the Ophioglossum genus. It is commonly known as Engelmann’s adder’s tongue, limestone adder's tongue This name is accepted name for the species in the family Ophioglossaceae subfamily Ophioglossoideae, . . This species is found in Alabama, Arizona, Arkansas, Costa Rica, Florida, Georgia, Honduras, Illinois, Indiana, Kansas, Kentucky, Louisiana, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Mississippi, Missouri, Nebraska, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, Virginia, West Virginia.