where basal 2 lateral (side) veins are slightly more conspicuous than others, and …

leaf juice=milky
mulberry  genus Morus

leaf=asymmetric, narrow;  bark=very thick ║ vertical ribs, looks covered with warts or puffy paint
hackberry  Celtis occidentalis

leaf=asymmetric, broad, hairless
American basswood or American linden  Tilia americana
leaf=asymmetric, broad, undersurface=​white + velvety
◼︎ white basswood  Tilia heterophylla

OR it does NOT (meaning the lateral [side] veins are about equal size), and …

leaves=very narrow, twigs=slender+limber, buds covered by ∧ one scale
willow  genus Salix

-OR-

leaves=not conspicuously narrow, twigs=not conspicuously slender nor limber, buds covered by >1 ⨇ scale, and …
veins=straight+parallel
Siberian elm  Ulmus pumila

leaf=long (13–18 cm) (5–7 in);  large one-sided clusters of flowers or fruit
sourwood  Oxydendrum arboreum

leaf=short (<10 cm) (<4 in);  petiole=long (about ½ of blade)
downy or common serviceberry  Amelanchier arborea
leaf=short (<10 cm) (<4 in);  some twigs=​thorn-like, bark=​shaggy
American plum  Prunus americana
leaf=short (<10 cm) (<4 in), teeth curve toward base
🍒︎ chokecherry  Prunus virginiana
leaf=short (<10 cm) (<4 in), firm, leathery, broad midrib
◼︎🍒︎ black cherry  Prunus serotina
leaf=short (<10 cm) (<4 in), thin, hairless
🍒︎ pin cherry  Prunus pensylvanica

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plant terminology

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🏠︎ 🌳︎ broadleaves, ╟ alternate, 🍂︎ simple non-lobed ▲▲ toothed multiple