There aren't any native crabapples from Maine, so it is MOST
likely to be the common apple, Malus sylvestris (AKA, M.
pumila -- or 'wild apple'). I suppose it could be an escaped
crab, but that seems extremely unlikely.

According to http://plants.usda.gov those apples can be found
in Maine:
Malus baccata (Siberian crabapple)
Malus prunifolia (plumleaf crabapple)
Malus pumila (paradise apple)

None of which are native.

Jim Lewis - - Tallahassee, FL - Our life is
frittered away by detail . . . . Simplify! Simplify. -- Henry
David Thoreau - Walden

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