Subspecies, varieties, forms and cultivars of plants belonging to the Parodia mueller-melchersii group

• Notocactus mueller-melchersii var. eugeniae (Vliet) N.Gerloff & Neduchal
• Parodia mueller-melchersii (Backeb.) N.P.Taylor: (Subsp. mueller-melchersii) has about 22 ribs, 1-3 central spines, 15-18 radials, and golden yellow flowers. Distribution: Sierra de los Animos, Uruguay.
• Parodia mueller-melchersii subs. gutierrezii (W.R.Abraham) Hofacker: has 22-24 ribs, 1 central spine, 12-16 radials, and reddish flowers. distribution: Rio Grande do Sul, Brazil.
• Parodia mueller-melchersii subs. winkleri (Vliet) Hofacker: has 20 ribs, one central spine, as many as 12 radials, and citron yellow flowers. Distribution:Tacuarembo, Uruguay.
• Parodia rutilans (Däniker & Krainz) N.P.Taylor: It is usually dull green in color and has 2 central spines. Distribution: Sierra Largo in Rio Grande do Sul, Brazil.
• Parodia rutilans subs. veeniana (Vliet) Hofacker: has usually bright green stems and has 1 central spine. Distribution: Tacuarembo.