Loosely mat-forming, to 40 by 10cm, sometimes more or less. Leaves very variable, but usually terete, or somewhat flattened on the upper surface, very fleshy, mostly 8 by 1.5mm but sometimes less or much longer, usually glabrous, green or suffused with red. Flowers white, five-petalled, about 9mm wide, many in cymose clusters, summer. Europe, North Africa and western Asia mostly in mountainous regions. S.a var. athoum, is a slower growing variety with wider, flatter leaves tinged heavily with red. Mediterranean Europe, especially the Balkans. S.a. 'Brownii', is a cultivated form from the U.S.A. very similar to var. murale. s162 S.a. subsp. clusianum (syn. var. glanduliferum), has pale green and pink foliage, less rampant. S.a. 'Coral Carpet' is lower growing with foliage which turns a dark, cherry-red in full sun, flowers pink. is162 S.a. 'Cristatum', produces fasciated shoots which can revert to normal. Dislikes winter wet. S.a. 'Faro Form' is a very tiny form from Faro Island in the Baltic, growing no more than 1cm high without the inflorescence. S.a. 'Hillebrandtii' is a colourful, prostrate but vigorous form from Central Europe. is162 S.a. 'Ibiza' produces faintly papillose leaves; dull but slow form from Ibiza. S.a. 'Laconicum' is similar to subsp. clusianum, but is darker red-brown. S.a. var. macranthum forms very low mats up to 1cm high, leaves 2mm, bright red in full sun, its form chloroticum is a bright yellow-green variant and chocolate-brown leaves and pink flowers, 'Cristatum' is a fasciated form of it and is hable to rot in wet conditions. S.a. 'Rubrifolium' is similar to low red Iberian forms but said to be a sport of S. murale; similar to 'Coral Carpet'. Recent exploration of Iberia and the Atlas Mountains has brought into cultivation several worthwhile variants of a non-invasive nature.