with ⬮ leaf scars  = …

narrow raised;  terminal buds[?]=⫴ hairy;  buds have a ⫴∧ hairy inner-scale between ⨇ 2 outer-scales[?]  or
🌙︎ crescent-shaped, with 3 bundle scars,[?] centered above side bud ⨇ scale[?] :

⬮ Leaf scars=narrow raised;  terminal buds=​⫴ hairy;  buds have a ⫴∧ hairy inner-scale between ⨇ 2 outer-scales

twigs=smooth;  outer bud ⨇ scales=sticky
🗻︎ American mountain ash  Sorbus americana
twigs=⫴ hairy
rowan or 🇪🇺 🗻︎ European mountain ash  Sorbus aucuparia

⬮ Leaf scars =🌙︎ crescent-shaped, with 3 bundle scars, centered above side bud ⨇ scale

terminal buds[?]   > 25 mm (>1 in)  or
terminal buds about 12 mm (½ in) :

terminal buds       >25 mm (>1 in)

fragrant, lots of resin, twigs=red-brown
balsam poplar  Populus balsamifera  or
balm of Gilead  Populus × jackii

terminal buds about 12 mm (½ in)

terminal buds egg-shaped;  twigs=gray-to-brown
♒︎ swamp cottonwood  Populus heterophylla
terminal buds ♦ taper at both ends;  twigs=​yellow-to-yellow-brown
eastern cottonwood  Populus deltoides

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🏠︎ 🌳︎🍃︎ broadleaf branches, ╟ alternate, list of attributes, no catkins thorns pods, w/terminal buds