| 1 |
Leaves reduced to phyllodes |
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(2) |
| + |
Leaves bipinnate |
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(3) |
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| 2 (1) |
Phyllodes 10-20 × 1.5-6 cm; inflorescence a spike. |
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1 A. auriculiformis |
| + |
Phyllodes 6-10 × 0.4-1 cm; inflorescence a head. |
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2 A. confusa |
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| 3 (1) |
Flowers in racemes or spikes |
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(4) |
| + |
Flowers in heads, then rearranged in panicles |
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(6) |
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| 4 (3) |
Trees armed; pinnae 10-30 pairs. |
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7 A. catechu |
| + |
Shrubs unarmed; pinnae 5-15 pairs |
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(5) |
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| 5 (4) |
Racemes 2-5 cm; midveins of leaflets close to upper margin. |
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8 A. yunnanensis |
| + |
Racemes shorter than 2 cm; midveins of leaflets subcentral. |
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5 A. glauca |
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| 6 (3) |
Trees or shrubs |
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(7) |
| + |
Climbers |
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(11) |
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| 7 (6) |
Shrubs armed; stipules spinescent. |
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18 A. farnesiana |
| + |
Shrubs unarmed or rarely with sparse prickles |
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(8) |
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| 8 (7) |
Leaflets 4-8 mm |
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(9) |
| + |
Leaflets 2-4 mm |
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(10) |
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| 9 (8) |
Leaflets glabrous; heads 6-8 mm in diam.. |
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4 A. decurrens |
| + |
Leaflets sparsely pubescent; heads ca. 10 mm in diam.. |
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13 A. teniana |
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| 10 (8) |
Legume 7-12 mm wide, glabrous, glaucous. |
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3 A. dealbata |
| + |
Legume 4-5 mm wide, pubescent. |
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6 A. mearnsii |
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| 11 (6) |
Midvein of leaflets starting centrally or subcentrally |
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(12) |
| + |
Midvein starting marginally |
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(13) |
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| 12 (11) |
Base of leaflets truncate, leaflets densely puberulent. |
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9 A. tonkinensis |
| + |
Base of leaflets rounded to cuneate, leaflets abaxially glabrous to faintly adpressed puberulent. |
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10 A. caesia |
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| 13 (11) |
Lateral veins of leaflets abaxially not forming a reticulate pattern |
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(14) |
| + |
Lateral veins of leaflets abaxially forming a reticulate pattern |
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(15) |
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| 14 (13) |
Petiolar gland in lower half of petiole, usually just above basal pulvinus; leaflets apically sharply acute, often bent forward. |
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16 A. pennata |
| + |
Petiolar gland at or above middle of petiole; leaflets apically obtuse, straight. |
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17 A. megaladena |
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| 15 (13) |
Midvein parallel to upper margin of leaflets. |
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11 A. vietnamensis |
| + |
Midvein not parallel to upper margin of leaflets |
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(16) |
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| 16 (15) |
Leaflets membranous, with a wrinkled appearance when dried; legume fleshy, with wrinkled surfaces seeming to break into segments. |
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12 A. concinna |
| + |
Leaflets papery, without a wrinkled appearance when dried; legume papery, smooth, not seeming to break into segments |
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(17) |
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| 17 (16) |
Branchlets glaucous, puberulent to tomentose when young. |
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14 A. pruinescens |
| + |
Branchlets brownish, glabrous. |
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15 A. delavayi |
