Synonyms- Thelocactus knuthianus, Echinocactus knuthianus, Gymnocactus knuthianus, Neolloydia knuthianus,
Body- Usually solitary, slightly depressed globular, 30-60mm high 35-70mm wide green-bluish.
Tubercles- Conical to 5-7mm long.
Spines- Radials- 18-20 white radiating slender, straight 6-8mm long.
Centrals- 1-2 white slender, straight to slightly curving up 10-16mm long.
Flowers- Light magenta with darker midrib 23-28mm long, 18-25mm wide.
Fruits- Yellowish-green nearly round 7-9mm long and 7-8mm wide.
Distribution- Guadalcazar in the state of San Lois Potosi (Mexico). Altitude 1500-2100m.
This species is easy to cultivate and fast growing but susceptible to rot. Requires full sun, careful watering and good ventilation to keep plant compact.
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