Noto Parodia aurisetus

Endemic to South America, this Notocactus or parodia spicies, produce wunderfull bright yellow flowers. They are grown for their spine formations, as well as for their attractive flowers. The genus name comes from the Greek for "cactus from the south". It has now been merged with Parodia. Since the name Parodia was used before Notocactus, it has precedence and all the Notocactus became Parodia.
Notocactus are almost always globose, elongating as they age, some species eventually reach 3 feet (90 cm). They are often solitary, rarely offsetting, or producing stolons.
Their flowers are funnel or bell shaped, yellow, or occasionally red. They come in groups of 3 or 4 at several times during the year Each flowers last around a week.

Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz