Siliceous cliff and rock communities of the mountains of Corsica and Sardinia, distributed from the supra-Mediterranean to the alpine level, with Potentilla crassinervia, Armeria leucocephala, Silene requienii, Saxifraga pedemontana ssp. cervicornis. Supra-Mediterranean and montane communities have Amelanchier ovalis ssp. rhamnoides, cryomediterranean, subalpine and alpine communities have Festuca sardoa, Phyteuma serratum, Helechryssum frigidum, Aquilegia bernardii, Leucanthemum corsicum, Scabiosa corsica, upper alpine communities are characterized by the presence of Draba dubia, Asplenium viride, Draba loiseleurii, Erigeron paolii and the absence of thermophile species.