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

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

Lenticels=inconspicuous against the bark

with . . .
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