Montane formations dominated by Lavandula angustifolia ("Lavandula vera") with Genista cinerea ssp. cinerea, Buxus sempervirens (both sometimes co-dominant), Astragalus purpureus, Onobrychis supina, Satureja montana, Artemisia alba, Catananche caerulea, Aphyllanthes monspeliensis, Thymus vulgaris characteristic of great surfaces of the supra-Mediterranean level of southwestern Alps of France, also occurring on the southern flanks of the Pyrenees in northern Spain.