Lax to fairly dense cushions, forming flattish or rounded hummocks up to 50cm across (in the wild) and over 30cm in cultivation. Leaves in small lax rosettes, linear-oblong to spathulate, 5-7mm long, hairy, with a characteristic revolute margin with 4-5 blunt teeth on each side, generally with white or yellowish woolly farina beneath. Flowers solitary, occasionally two per rosette, sessile; corolla yellow, the tube 13-18mm long, the limb 8-10mm. diameter, with narrow- to broad-oval, spreading lobes notched at the apex. N. Iran, C. Elburz Mountains, on shaded limestone cliffs, 300-3200m. Recent introductions of new material include SLIZE035, T4Z1214 and JZZ05-161. One of the finest and easiest of species to cultivate, quick growing and floriferous. Plants should be given ample water during the growing season. Although readily raised from home-produced seed the best forms are best propagated from cuttings. Several clones have been given cultivar names such as 'Gravetye', 'Paul Furse', 'Bevere' and 'Phyllis Carter'. Despite it's propensity to set seed readily there are comparitively few hybrids.
Reference: ALPINE GARDEN SOCIETY PLANT ENCYCLOPAEDIA