where basal 2 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 side veins are about equal size), and …

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

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plant terminology