Subspecies, varieties, forms and cultivars of plants belonging to the Parodia scopa group

• Notocactus scopa f. cobrensis (N.Gerloff) N.Gerloff & Neduchal: has dark-red central spines and shorter white spines and wool around. It is very slow growing. Distribution: Rio Grande do Sul (Brazil)
• Notocactus scopa var. murielii Hofacker: has silvery spined stems. Distribution: Uruguay.
• Notocactus scopa f. xicoi (W.R.Abraham) N.Gerloff & Neduchal: has fewer ribs and fewer spines. Particularly striking are the numerous purple brown central spines. Distribution: Pedras Altas and Herval, Rio Grand do Sul, Brazil.
• Notocactus scopa f. xiphacanthus (W.R.Abraham) N.Gerloff & Neduchal: has larger stems with fewer ribs and usually a long, dark, sword-shaped central spine. Distribution: Minas, Lavalleja, Uruguay.
• Parodia scopa (Spreng.) N.P.Taylor: has stems with 30-40 ribs, about 4 central spines, and 40 or more radials. Distribution: Southern Brazil and Paraguay.
• Parodia scopa f. cristata hort.: Crested form.
• Parodia scopa subs. marchesii (W.R.Abraham) Hofacker: has stems with fewer ribs (19-28), 2-4 white or yellowish central spines, and about 40 radials. Distribution: Treinta y Tres, Uruguay.
• Parodia scopa subs. neobuenekeri (F.Ritter) Hofacker & P.J.Braun: stems with 18-21ribs, 6-12 strong central spines, and 30-40 radials. Distribution: near Camaqua, Rio Grande do Sul, Brazil.
• Parodia scopa f. splendens hort.
• Parodia scopa subs. succinea (F.Ritter) Hofacker & P.J.Braun: has stems with 18-24 ribs, 8-12 central spines, and 15-30 radials. Distribution: near Sao Gabriel, Rio Grande do Sul, Brazil.
• Parodia scopa subs. succinea f. albiseta hort.: has pure white spines.
• Parodia scopa var. sulphurea hort.: This is only a common hoticultural name for "Parodia scopa ssp. succinea"
• Parodia scopa cv. inermis: has spineless areoles with a short white wool, they are arranged geometrically and contrast with the stem. A few small bristly spines are occasionally produced in the flowering areoles.
• Parodia scopa cv. inermis cristata: Crested form.