Subspecies, varieties, forms and cultivars of plants belonging to the Stenocactus multicostatus group-complex

• Stenocactus erectocentrus hort.: ( Stenocactus multicostatus ? ) Plant with beautiful spination. The upper spines are very long whit a central stout and flat erected spine, while the lower ones are shorter and point downwards. The spines are different lengths.
• Stenocactus lloydii (Britton & Rose) A.Berger: has long white to dark red papery spines. Ribs very tight wavy. Flowers white/purple almost concealed among the spines. "lloydii" and "multicostatus" are considered part of a multiform species.
• Stenocactus multicostatus (Hildm. ex K.Schum.) A.Berger: It is very characteristic, typically with 50 to 100 (or more) very tight, thin and wavy ribs. It is indeed very variable.
• Stenocactus multicostatus f. cristatus hort.
• Stenocactus multicostatus f.ma ( Coll. Šnicer ) (Hildm. ex K.Schum.) A.Berger
• Stenocactus multicostatus f. monstruosus hort.: Monstrous form with very long areoles forming vertical comb-like lines of spines.
• Stenocactus multicostatus subs. zacatecasensis (Britton & Rose) U.Guzmán & Vázq.-Ben.: has 3 brownish, not annulate central spines of which the middle one is flat. Flowers nearly white or with a pink mid-vein and the apex of the plant umbilicate. Distribution: North Zacatecas, Mexico.
• Stenocactus zacatecasensis var. moranensis Bravo