Pediocactus Knowltonii belongs to the family Cactaceae and is a rare species of cactus that is native to the western United States. This cactus is known by several synonyms such as Pediocactus peeblesianus var. fickeiseniorum and Sclerocactus peeblesianus var. fickeiseniorum. Pediocactus Knowltonii is a small, slow-growing cactus, with a distinctive cylindrical shape and straight spines. The plant is often found growing in sandy or gravelly soil in the high desert regions of the western US. Despite its rarity, this cactus has become a popular addition to many cactus collections due to its unique and beautiful appearance.