Echinocactus horizonthalonius
Specification
Echinocactus horizonthalonius is a relatively small barrel cactus that normally grows unbranched.
Pale, grey-green to bright glaucous grey-blue, flat-topped or hemispheric, and deep-seated in substrate, spherical with age or stoutly short cylindrical.
The body of this plant is a chalky blue colour, and some forms have magnificent spines.