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

• Echinocereus longisetus (Engelm.) Rümpler: has long bristle like white spines, cylindrical erect stems up to 30 cm long and less than 8 cm in diameter, 17 or fewer ribs. Distribution: N. central Coahuila and w. central Nuevo Leon.
• Echinocereus longisetus subs. delaetii (Gürke) N.P.Taylor: It has stems up to 8 cm in diameter, 17-24 ribs and hairlike curled central spines. Distribution: Southern Coahuila above 1800 m.
• Echinocereus longisetus subs. freudenbergeri (G.Frank) W.Blum in W.Blum et al.: has solitary or clustering cylindrical stems up to 15 cm high, 4-6 cm in diameter. Spines 20-25, whitish to gray-brown to brown, up to 2.5 cm long. Distribution: Cuatrocienegas and Torreon, Coahuila, Mexico.
• Echinocereus longisetus var. rayonesensis (N.P.Taylor): has thinner stems about 2.5 to 3.5 in diameter and spines are longer and overall appearance is whiter.