(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).
This is a good looking solitary barrel cactus
Origin and habitat: Córdoba, Northwest Argentina.
Flowers: The plant produces club-like purple buds on the older areoles on the side part of the stem, which develop into pinkish rose (rarely red) flowers, to 5 cm long and 7 cm in diameter. Often when full open the flowers remain almost tubular in shape and fail to open as broadly as other species do.
Fruits: Ovoid, green.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz