When our greenhouses are as crowded as ours are I come to prize nice little miniatures like this plant, Monanthes brachycaulos. Or at least that's what the label said when we obtained it. To me it looks more like M. polyphylla, but I'm far from an expert on this genus.
It's quite easy to grow. Just keep it a bit on the dry side during the winter.
Members of the Crassulaceae family, the genus mostly endemic to the Canary Islands and Salvage Islands, with some found on Madeira.