with leaflets usually numbering/arranged:
leaflets=5 or more, radiating from 🍁︎ one point (✋︎ palmate);  fruit a large capsule
🌰︎ buckeye / horse chestnut  genus Aesculus

OR they are NOT (they have leaflets=3 or more, arranged 🌿︎ pinnate ), but with …
3 leaflets, side leaflets asymmetrically 2-lobed, end leaflet not- or 3-lobed, each lobe ending in a very-pointy (but soft) tip;  vine;  purple elongated flower clusters
kudzu  Pueraria montana

OR they are NOT, but with …
leaflets have different sizes and shapes
boxelder  Acer negundo

OR they are NOT, but with …
leaflets have no petiolule (grow direct from leaf-stem);  leaflets=7-(9)-11;  leaf length=25-40 cm (10-16 in)
black ash  Fraxinus nigra

OR they are NOT, but with …
leaflets are regularly toothed;  twigs=■ square with corky wings
blue ash  Fraxinus quadrangulata

OR they are NOT, but with …
twigs and leaf stalks are hairy
red ash  Fraxinus pennsylvanica

OR they are NOT, but with …
leaflet uppersurface and undersurface=​green;  leaf scar shape=D◗
red ash variant green ash  Fraxinus pennsylvanica

leaflets=5-(7)-9;  leaflet undersurface=​whitish;  leaf scar shape=C
white ash  Fraxinus americana

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plant terminology