with . . .
buds have inner-scale=hairy, between 2 outer-scales;          twigs=hairy   >   🗻︎ European mountain ash Sorbus aucuparia
buds have inner-scale=hairy, between 2 sticky outer-scales;  twigs=smooth   >   🗻︎ American mountain ash Sorbus americana

buds=smooth, red-brown, stalked, covered like a clam (valvate or duckbill);  pith=triangular   >   European alder Alnus glutinosa

bud scales=overlapping;  leaf scars have single bundle scar;  fruit may persist   >   American persimmon Diospyros virginiana

bud scales=overlapping;  leaf scars have ≥3 bundle scars;  twigs+buds=chestnut-brown;  pith=5-sided;  many raised white lenticels   >   🌰︎ American chestnut Castanea dentata

buds=red or red+green;  bud scales=overlapping, slightly hairy;  leaf scars have ≥3 bundle scars   >   white basswood Tilia heterophylla
buds=red or red+green;  bud scales=overlapping, not hairy;      leaf scars have ≥3 bundle scars   >   American basswood Tilia americana