Gymnocalycium mihanovichii is identified by the yellow-brown, not fully opening flowers. It's considered a miniature cactus, this is about as big as it's ever going to get. Cool looking out of bloom and great for small spaces. In it's natural habitat (Paraguay) it isn't exposed to full sun all year, growing under bushes. This makes it an ideal cactus for growing indoors for most of the year if your conditions are like mine and you have to. I put it out in full sun for the few months of summer we have and this is the result.
|1st bloom opening|
|My hand for size reference, and I have pretty small hands.|
|From the top|