Ophioglossum engelmannii

Ophioglossum engelmannii, commonly known as the limestone adder's-tongue,^[1] is a species of fern native to the Western Hemisphere. It is widespread and native to the United States, Mexico, and Central America.^[1] Its primary natural habitat is dry barrens and glades in calcareous areas.^[2]

Ophioglossum engelmannii
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Ophioglossales
Family:	Ophioglossaceae
Genus:	Ophioglossum
Species:	O. engelmannii
Binomial name
Ophioglossum engelmannii Prantl

It is a small species that produces leaves in the spring and dies back in the summer. A second growth of leaves is sometimes produced with the fall rains.^[3]