It is found alongside plant species such as American green alder ("Alnus viridis" ssp. Trees in this family include the American green alder and the mountain alder. Green alder ("Alnus crispa") is also found in the valley. By contrast, the widespread "Alnus alnobetula" (green alder) is rarely more than a 5-m-tall shrub. And the green alder bushes arch over our heads, forming a cool and shady tunnel.