Noun mountain alder has 2 senses
  1. mountain maple, mountain alder, Acer spicatum - small shrubby maple of eastern North America; scarlet in autumn
    --1 is a kind of maple
  2. white alder, mountain alder, Alnus rhombifolia - tree of western United States
    --2 is a kind of alder, alder tree
    --2 is a member of Alnus, genus Alnus
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