| 1A. Leaves reduced to phyllodes | Acacia s.s (except sect. Botrycephalae) |
| 1B. Leaves bipinnate | 2 |
| 2A. Prickles present on branchlets and/or leaves; stipules not spinescent | Senegalia |
| 2B. Prickles absent; stipules spinescent | Vachellia |
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