Native to an area near Esmeralda in the Antofagasta region of Chile, Copiapoa esmeraldana is a solitary globular to columnar cacti that can reach 6 inches high and 2 inches around. The yellowish flowers are about an inch across.
     I got this one from Arid Lands. It was a funky orange color in their greenhouse but turned a gorgeous purple after I gave it some good light for awhile.