| 1A. Leaves bipinnate, including adult stage | Group A |
| 1B. Leaves reduced to phyllodes, bipinnate leaves found on seedlings, rarely persisting with phyllodes in adults | 2 |
| 2A. Flowers arranged in cylindrical spikes | 3 |
| 2B. Flowers arranged in globular heads | 4 |
| 3A. Phyllodes <10 mm wide, with obscured nerves | Group B |
| 3B. Phyllodes >10 mm wide, with 3–4 (–5) conspicuous nerves | Group C |
| 4A. Phyllodes with single central midrib | 5 |
| 4B. Phyllodes with (1) 2 or more longitudinal veins on at least one face | Group F |
| 5A. Stipules spinescent | Group D |
| 5B. Stipules not spinescent | Group E |
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