Subspecies, varieties, forms and cultivars of plants belonging to the Escobaria tuberculosa group

• Escobaria tuberculosa (Engelm.) Britton & Rose: Stem extremely variable branched and small but sometimes solitary and larger. Spines 21-41 per areole, ashy white, grey, or pale tan in colour, with the tips of the largest spines reddish brown or reddish black.
• Escobaria tuberculosa var. durispina (Quehl) Borg
• Escobaria tuberculosa f. gigantea n.n.: has larger stems up to 20 cm tall and remain usually unbranched, but apart the solitary growth habit and larger dimension, it doesen't appear to differ from the typical Escobaria tuberculosa in any significant respect.
• Escobaria tuberculosa var. varicolor (Tiegel) S.Brack & K.D.Heil