Has a spherical stem with a diameter of up to 10 cm, lengthens with age and forms lateral shoots in the lower part.
The epidermis is glossy green, brilliant. It has 5-8 flat ribs interrupted by small transverse grooves, ribs with weakly pronounced tubercles. Areoles are not numerous, large, covered with short light brown, later gray hairs.
There are no central spines. Radial - most often 3-5, in the lower part of the stem 8, they have a length of slightly more than 1 cm, whitish-yellow, wavy curved, tightly attached to the surface of the stem.
The flowers grow near the crown of the head, have a white color, sometimes with a pinkish tint up to 5 cm long, with a long flower-bearing tube and numerous long narrow petals bending outward. The ovary is short, wide, light green, with rare scales.
Compared to other species of this genus, it has a wide range : found in southern Brazil ( Rio Grande do Sul State ), in northern Uruguay , Argentina , and in southern Paraguay .
The view was discovered in 1825 by Friedrich Zellov in Uruguay and southern Brazil. He sent the discovered cactus to Berlin , where three years later, he received the name Echinocactus denudatus . In 1845, Peiffer attributed this species to the genus Gymnocalycium.