with . . .

thorns=pointed twigs and leaf=🍂︎ non-lobed, and . . .
tip=long tapering, undersurface=vein network intricate   >   American plum Prunus americana
undersurface=wooly hair   >   🍎︎ common apple Malus pumila
undersurface=___ smooth     >   🍐︎ common pear Pyrus communis

-OR-

thorns=pointed twigs and leaf=somewhat ♧ lobed, and . . .
twigs, petioles, leaf undersurface=woolly   >   🍎︎ prairie crabapple Malus ioensis
twigs, leaves=not woolly   >   🍎︎ wild crabapple Malus coronaria

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plant terminology