Opuntia setocarpa, una especie nueva de nopal del occidente de México

Opuntia setocarpa, a nopal from state of Jalisco is described and illustrated. The species belongs to the series Criniferae Pfeiffer. It is distinguished by its cladodes with papillose epidermis, small and close together areoles, the areoles of cladodes, pericarpel and fruits with white long bristles, these becoming caducous. Information about its habitat is provided and its relationship with the closest species is discussed.