1A.	Leaves simple phyllodia; seeds with pulpy aril forming a cap or encircling seed; exotic, cultivated plants	Acacia
1B.	Leaves bipinnate; seeds without pulpy aril; native, wild plants	2
2A.	Prickles or spinescent stipules absent	3
2B.	Prickles or spinescent stipules present	4
3A.	Petiole without gland; inflorescences arranged in spheric capitula	Acaciella
3B.	Petiole with gland; inflorescences arranged in elongated spikes	Mariosousa
4A.	Branches without prickles; stipules spinescent, commonly paired; inflorescences arranged in spheric capitula; ovary sessile or subsessile	Vachellia
4B.	Branches with prickles irregularly distributed along the stem, often solitary (not in pairs); stipules membranous, not spinescent; inflorescences arranged in spheric capitula or elongated spikes; ovary elevated on a short axis	Senegalia