Rebutia weingartia neocumingii
(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).
Originally from Bolivia, it can grow up to 3" wide, and 7" tall. This compact cactus is one of the most vigorous and earliest bloomers. Flowers are usually yellow. This species blooms several times in one season. The flowers are produced in early summer and remain open for five or six days.
Recommended temperature zone: USDA: 9-10
Frost tolerance: Hardy
Minimum avg. temperature: 40°F (4°C)
Origin: Southern Bolivia
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz