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Foliage:
alternating oval leaves grow directly on the branch. Each has 10 to 15 parallel veins either side of the central vein. They are ribbed on the underside of the leaf.
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Flowers:
greenish flowers grow from the leaf axil, blooming from May to June.
Fruit:
the fruit becomes black when ripe and contains a stone.
Size:
up to 4 m.
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Habitat:
heath, sparse woodland, cracks among rocks and avalanche tracks: the flexible branches of Alpine buckthorn bend under the weight of snow and spring back up when the snow thaws.
In the Pyrenees:
throughout the range, from hill level (below 800 m) up to subalpine level (1,900 m).
Typical companions:
borderea pyrenaica, Pyrenean meadow rue, cyclamen-leaved crowfoot, silvery vetch, Pyrenean speedwell, Pyrenean pheasant's eye, Pyrenean spurge, French sorrel...
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Trees and shrubs
Rhamnus alpinus 
