This plant has been called the Agave Plant. It has fat tubercles that resemble the leaves on the genus, Agave. This cacti gets more and more handsome with age. As the plant matures the center will get thick and wooly kind of like an Ariocarpus. The flowers are white or pale yellow with butter yellow centers. Looks best with filtered sunlight so not a candidate for the top shelf.
Size: 2.5 inch diameter small 5/6/18