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