Subspecies, varieties, forms and cultivars of plants belonging to the Echinocereus chisoensis group

• Echinocereus chisoensis W.T.Marshall: Has stems usually not annually constricted, and flowers up to 6 cm long with the bases of
  the inner perianth parts deep red. Origin: Big Bend region of Texas.
• Echinocereus chisosensis subs. fobeanus (Oehme) N.P.Taylor: has stems that are often constricted into annual sections, and flowers up to 9.5 cm long with the bases of the inner perianth parts pale green or light brown. Distribution: Coahuila and Durango.
• Echinocereus metornii G.Frank