Fir Clubmoss is a plant that belongs to the Lycopodiaceae family and is native to North America. It's a small evergreen plant that is commonly found in forests, mountains, and rocky areas. Its scientific name is Huperzia selago, and it's also known by various other names such as mountain fir, fir-moss, and rock crystal. Its leaves resemble those of a fir tree, hence the name "Fir Clubmoss." The plant has been used for medicinal purposes in many cultures to treat various ailments. Its close cousin, the Chinese Clubmoss, is also often used for similar purposes. Despite its uses, the plant is not a true moss, as it has vascular tissue and produces spores.