It’s vegetative association that often thrives on the sub-alpine plane, extends along crumbling  slopes, humid north-facing detritic fans or along the banks of glacial streams.
The most important specie is the green alder, a deciduous shrub that can easily reach a height of three metres and cover large areas making them impenetrable.

The green alder is a pioneer specie that succeeds in stabilising crumbling soils with its extensive root system and is resistant to avalanches thanks to its flexible branches that bend but don’t break under snow.
It grows in association with tall grasses (Megaforbie) that have specific nitrogen requirements.

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