Gymnocalicium tucavocense damsii
(This plant comes in a 3.5" pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped in its pot to prevent any damage to the roots).
The genus name "Gymnocalycium" comes from the Greek for "naked calyx" referring to the flower buds bearing no hair or spines. The stem can grow up to 10 cm tall, 8-15 cm in diameter, colorful and highly decorative, with horizontal clear and dark strips. The clear areas (above the areoles) are pastel-grey-pink while the dark zone (below the areoles) are deep olive-green to brown-purple. The spines are nearly useless in terms of defense. It is a summer easy to grow species that offers no cultivation difficulties. Water regularly in summer (but do not over water). Keep this plant almost dry in winter at a minimum temperature of 0°C.
Recommended temperature zone: USDA: 9b-11
Minimum avg. temperature: 50°F (10°C)
Sun exposure: Light shade
Origin: Brazil, Bolivia, Paraguay
Growth habits: Solitary or slowly clustering, up to 4" tall (10 cm), 3" in diameter (8 cm)
Watering needs: Summer grower, water regularly in summer, keep rather dry in winter
Blooming habits: Light pale pink flowers about 1"in diameter
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz