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The Mountain Ash is Sorbus aucuparia. I know of no tree called the Rocky Mountain Ash.
Mountain Ash RFC was created in 1875.
Mountain Ash leaves are not poisonous to horses or other animals. The berries of the Mountain Ash are not poisonous either.
Yes
Fraxinus excelsior is the common Ash tree
Sorbus aucuparia is the Mountain Ash tree
Eucalyptus regnans is the Australian Mountain Ash tree
and Zanthozylum spp. are the Prickly Ash family