Subspecies, varieties, forms and cultivars of plants belonging to the Echinopsis rhodotricha group

• Echinopsis rhodotricha K.Schum.: has 8-13 ribs and 4-7 radial spines. Distribution: Paraguay and north-eastern Argentina.
• Echinopsis rhodotricha var. argentinensis Rud.Mey.: has shorter, darker stems with radial spines. Distribution: Argentina.
• Echinopsis rhodotricha var. brevispina F.Ritter: stems to 40 cm tall; ribs 20-30 mm high areoles 3-7 mm long. Radial spines 2-8, 4-15 mm long, central 0-1, rarely 2-3, 10-20 mm long. Distribution: west of Asunción, Paraguay.
• Echinopsis rhodotricha subs. chacoana (Schütz) P.J.Braun & Esteves: has 12—18 ribs and 7—8 radial spines. Distribution: Chaco Boreal region of Paraguay,
• Echinopsis rhodotricha var. roseiflora K.Schum.: has pale rose-coloured inner perianth-segments. Distribution: near Concepcion, Paraguay.
• Echinopsis rhodotricha var. spinosior (F.Ritter) F.Ritter: stems 12-20 cm thick; ribs l0-15; Areoles 8-12 mm long; radial spines 8-9, 2-4 cm long, centrals, 3-4, 3-8 (-10) cm long. Distribution: Taringuiti, Prov, Gran Chaco, Bolivia.