Lenticels=conspicuous, light-colored, raised against dark shiny bark

thorn-like twigs;  bark=dark red-black, peeling;  keeps low branches   >   American plum Prunus americana or
no thorn-like twigs;  bark and buds taste bitter :

Lenticels=inconspicuous against the bark

leaf scar=compact, with 3 bundle scars or
leaf scar=thin crescent :

Leaf scar=thin crescent

buds=smooth and ∧ pointed   >   common pear Pyrus communis
buds=smooth and round   >   hawthorns genus Crataegus

buds=hairy and blunt; tree=wide   >   🍎︎ common apple Malus pumila

buds=wooly tips;  twigs=smooth   >   🍎︎ wild crabapple Malus coronaria
buds=wooly tips;  twigs=wooly   >   🍎︎ prairie crabapple Malus ioensis