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|1 Leaves odd-pinnately compound.|
|..2 Leaflets narrowly ovate, acuminate at the apex, at least the lowermost on a leaf with prominent glands at the tip of shallow lobes along the lower margin of the leaflets; [alien, widespread]; [tribe Ailantheae]|
|..2 Leaflets elliptical, obtuse at the apex, lacking shallow lobes and glands; [native, of peninsular FL]; [tribe Simaroubeae]|
|1 Leaves simple or unifoliolate (appearing simple).|
|....3 Leaves < 2.5 cm long and < 0.7 cm wide, coriaceous; [of dry sites in s. TX southwards]; [tribe Casteleae]|
|....3 Leaves > 9 cm long and > 3 cm wide; [of wetland sites of se. TX, AR, MO, MS, FL, and GA]; [tribe Leitnerieae]|