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Pediocactus (Greek language: πεδίον (pedion) means "plain", "flat", "field") is a genus of cactus native to the Western United States. The genus comprises between 6 and 11 species, depending upon the authority. Species of this genus are referred to as hedgehog cacti, though that name is also applied to plants from the genera Echinocereus and Echinopsis. Species may also be referred to as pincushion cacti, a common name which is also applied to other genera.
The bell-shaped flowers at the top of the shoots come in colors ranging from yellow to magenta to white, with diameters of . The flowers are characterized by a glabrous or nearly glabrous pericarpel and a short floral tube. Flowering typically occurs in spring, but certain species form buds in late autumn, with some capable of flowering even in their juvenile stages.
The fruits, initially greenish and cylindrical to spherical, transform into reddish-brown, dry structures upon ripening. Opening with a vertical gap, the fruits may be bare or possess a few scales. As the fruit opens, the remaining flower partially detaches, leaving a residue resembling a cap. The fruits contain blackish-brown, wrinkled to tuberous, obovate, or pear-shaped seeds. These seeds ripen 4 to 6 weeks after flowering and remain viable for an exceptionally long period, lasting at least 10 years.
Sclerocactus and Pediocactus were also at one time reduced to synonymy, but this is not at present considered to be correct.
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