Spineless  cultivar  with  flamboyant  jagged  flowers.

Photo of conspecific taxa, varieties, forms and of plants belonging to the Thelocactus bicolor complex (This Taxon has lots of synonyms ( like many other cacti) whit several controversial varieties and subspecies and comprises a multitude of different forms, but where each form is linked to others by populations of plants with intermediate characteristics):

• T. bicolor var. bicolor (Frost hardiness -7°C )
• T. bicolor var. bolaensis (Frost hardiness -12°C ) Origin: Coahuilafrom Sierra Bola, up to 20 cm tall.
• T. bicolor var. commodus  It has been described as having only one, porrect, central spine, but with a careful observation it is possible to notice that the upper central spines are so appressed to the stem that they can be easily mistaken for radials.
• T. bicolor var. ellipticus is referable to bicolor.
• T. bicolor var. flavidispinus (Frost hardiness -12°C ) Texas 8cm in diameter, 5cm tall.
• T. bicolor var. heterochromus
• T. bicolor var. pottsii (Referable to bicolor var. heterochromus).
• T. bicolor var. rhodophthalmus is referable to bicolor.
• T. bicolor var. schottii (Frost hardiness -12°C) coming from the Big Bend area Texas, Chihuahua) characterized by a very long, papery upper spine.
• T. bicolor var. schwarzii 1 0° F (-12°C) Tamaulipas
• T. bicolor var.  texensis is an invalid name for a Texas form.
• T. bicolor var. tricolor (Frost hardiness -7°C ) A form with bright red spines. Plants with these characters can be found around Saltillo, Coahuila.
• T. bicolor var. zwakii,  It is not sufficiently distinct to deserve a subspecies rank.

Cultivars: Thelocactus bicolor cv. INERMIS

Origin:  Garden origin (Nursery produced cultivar)

Conservation status: Listed in CITES appendix 2.

Cultivation: Easy to cultivate in a very gritty substrate with much drainage. Water regularly in summer, but do not overwater (very rot prone), it prefer a completely dry place during winter. An unheated greenhoouse would be perfect. It can survive low temperatures (appr. -12 C). Full sun to light shade

Propagation: Graft or (rarely) cuttings if available. The cutting should not be disturbed until they are well rooted after which they can be planted separately in small pots.