Less common species that are relics of the last Ice Age include white alder, bigleaf maple, and black cottonwood.

Vegetation in the forests includes California sycamore, the big leaf maple, and red alder.

Plants along the shoreline include dwarf willow and alder, plus 125 different wild flowers.

Trees found in the valley include sessile oak, beech, alder, rowan, ash and willow.

Other recorded foodplants include alder, apple, birch, mountain ash, serviceberry and willow.

Common hardwoods include big leaf maple and red alder.

Trees in the monument include Douglas-fir, oak, white fir, and alder.

The most common woods used for electric guitar body construction include maple, basswood, ash, poplar, alder, and mahogany.

The temperate deciduous forests include oak, birch, maple and alder.

Characteristic trees include alder, willow and sallow.