Subspecies, varieties, forms and cultivars of plants belonging to the Eriosyce curvispina group

• Eriosyce curvispina (Bertero ex Colla) Katt.: (var. curvispina) stem solitary with strongly curved spines more than 20 mm long. Flowers to 5,5 cm in diameter. Distribution: widespread throughout the range of the species.
• Eriosyce curvispina var. aconcaguensis (F.Ritter) Katt.: always solitary with strongly curved spines and pure yellow flowers. Stem 4,5 cm in diameter. Distribution: Cuesta Las Chacras, north of Llaillay.
• Eriosyce curvispina subs. armata (F.Ritter) Katt.: is similar to variety aconcaguensis differs only for the yellow flowers with deep red midveins. Distribution: south and west of Santiago.
• Eriosyce curvispina var. choapensis (F.Ritter) Katt.: has shor but strongly curved spines only 10-15 mm long. Distribution: Valley of the Rio Choapa.
• Eriosyce curvispina var. mutabilis (F.Ritter) Katt.: forms clusters. Distribution: endemic Punto Pichidangui.
• Eriosyce curvispina var. robusta (F.Ritter) Katt.: stem solitary. Flowers have much elongated pericarpels. Distribution: Ocoa.
• Eriosyce curvispina subs. tuberisulcata (Jacobi) Katt.: has straight, very robust spines and nearly red flowers. Distribution: Laguna Verde and adjacent areas, South of Valparaiso, Chile.
• Eriosyce robusta var. cabildensis hort.: has robust tan-brown spines. Distribution: Cabildo, Chile.
• Pyrrhocactus andicola (F.Ritter) F.Ritter: has long thin and very dense white, yellowish spines. Distribution: Cerro Chivato (between Santiago and
  Los Andes)
• Pyrrhocactus curvispinus var. combarbalensis F.Ritter: has very pruinose stems (like some copiapoas). Distribution: West of Combarbalá
• Pyrrhocactus curvispinus var. santiagoensis: not dissimilar to var. curvispina. Distribution: Aconcagua valley, East of Santiago.
• Pyrrhocactus horridus (J.Rémy ex Gay) Backeb.
• Pyrrhocactus pamaensis F.Ritter: has dark purple-black stems with brownish-black or dull grey spine. Distribution: Below Combarbalá, , Ovalle East and North-East, Coquimbo, Chile