Succulent perennial of the Crassulaceae family. The name juratense refers to a form or population of Sempervivum tectorum originating from the Jura, without currently recognized taxonomic status in reference floras; it is used here to trace the geographical origin of this lineage within the collection.
This form is distinguished by its particularly large and flat rosettes, very open, with broad, obovate leaves, of a bright and almost uniform green, with only the mucronate tip tinged with reddish-brown. The external leaves spread horizontally, giving the rosette a very regular, almost geometric architectural appearance, more reminiscent of an artichoke than the more colorful forms of the species. The marginal ciliation is fine and discreet. The tight center of the rosette reveals the internal leaves gradually more erect and more distinctly tinged with dark red at their top.
This green dominance, little or not reddened even in full sun, is the most characteristic feature of this form and clearly distinguishes it from the alpine or Pyrenean populations of the species, often much more colorful.
Cultivation identical to that of the type species, in full sun or light partial shade, well-drained substrate, poor to moderate. Perfectly hardy.