Perennial succulent of the Crassulaceae family. The name thompsonianum does not appear in the consulted reference floras; it is reproduced here in quotes pending taxonomic confirmation. It could refer to a cultivar, a collection selection, or a form of unknown origin.
The plant appears as dense clumps of small, globular, and very tight rosettes, with narrow, upright leaves strongly curved towards the center, from yellow-green to medium green, with tips distinctly colored in orange-brown to reddish-brown. The ciliation is clearly visible on the leaf margins, giving the rosettes a finely bristled appearance. The leaf spiral is very regular and geometrically marked, a striking feature upon observation.
This compact, hemispherical habit, with rosettes tightly packed against each other, evokes certain mountain forms with small rosettes, without the possibility of specifying the geographical origin or relationship with certainty.
Grown in full sun, very well-drained substrate, poor to moderate. Perfectly hardy under the usual cultivation conditions of houseleeks.