This species is distributed throughout southern Brazil, Uruguay, Paraguay and Argentina. The illustrated specimen is the cultivar N. ononis f. vencluyanus. It differs from the type by having reddish-orange blossoms. Like every other species of this genus, it has a purplish-red stigma. The globose body, 5-11 cm (2-4 in) across, has 6-13 ribs that are not very pronounced. The areoles carry 8-15 radial spines coloured yellow and three to four central spines coloured brown. The, measuring up to 6 cm (2.5 inch) and coloured a deep vivid yellow, emerge in a wreath round the thickly woolly crown. The fruits are relatively small, retaining the remains of the perianth for a long time. The have short dry appendages (strofioles).