| 1A. Interjugary glands absent | 2 |
| 1B. Interjugary glands present | 3. A. mearnsii |
| 2A. Young foliage tips pale blue; leaflets (1–) 2–4 (–6) pairs per pinna | 1. A. baileyana |
| 2B. Young foliage tips white, cream to golden; leaflets 6–30 pairs per pinna | 2. A. dealbata |
| 2C. Young foliage tips silvery or yellowish-white; leaflets in 3–12 pairs per pinna | 4. A. pubescens |
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