with leaf scars=: narrow raised; terminal buds=hairy; buds have hairy inner-scale between 2 outer-scales or crescent-shaped, with 3 bundle scars, centered above is side bud scale :
twigs=smooth; outer bud scales=sticky🗻︎ American mountain ash Sorbus americana twigs=hairy🗻︎ European mountain ash Sorbus aucuparia
terminal buds > 25 mm (>1 in) or terminal buds about 12 mm (½ in) :
fragrant, lots of resin, twigs=red-brownbalsam poplar Populus balsamifera or balm of Gilead Populus × jackii
terminal buds egg-shaped; twigs=gray-to-brown♒︎ swamp cottonwood Populus heterophylla terminal buds ♦ taper at both ends; twigs=yellow-to-yellow-browneastern cottonwood Populus deltoides
🌳︎ broadleaf 🍃︎ branches, ╟ alternate, list of attributes, no catkins thorns pods, w/terminal buds