A local aggrettion of a species other than the dominant one in an associion brings about a plant society; for example, societies of Ericd etralix, of Scirpus caespitosus, of Molinia coerulea, of Carex irta, of Narthecium ossifra gum, and others may occur within i association of Calluna vulgaris.
On the whole, it consists of local species of some widely distributed northern genera, such as Carex, Poa, Ranunculus, &c., with alpine types of strictly south temperate genera, characteristic of the separate localities.
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