Pediocactus nigrispinus (Snowball Cactus) is a species of plants in the family cacti. They are native to Western North America and The Contiguous United States.
Definition: A grassland biome is a terrestrial biome which includes, across its entire spatial extent, an unbroken layer of grasses (Gramineae), sedges (Cyperaceae) or rushes (Juncaceae).