Limestone Adder's-tongue (Ophioglossum Engelmannii) is a perennial fern in the Ophioglossaceae family with moderate care difficulty. It requires moderate watering and partial shade or dappled_shade light in USDA hardiness zones 6-9. This plant is safe for cats and dogs.

Ophioglossum engelmannii is a small perennial fern known commonly as limestone adder's-tongue, characterized by its deciduous fronds and preference for calcareous rocky habitats.