| 1. | The pappus may present awns or scales, or infrequently neither.
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| 2. | The pappus is less than one millimeter long in most species.
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| 3. | The inflorescence is a narrow cluster of several pappus of hairs.
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| 4. | The leaves are linear in shape and arranged pappus of scales.
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| 5. | The inflorescence bears bracts studded with large resin pappus of scales.
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| 6. | The inflorescence is made up of clusters of pappus of scales.
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| 7. | The plant produces several pappus of many white or brown bristles.
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| 8. | The fruit is a flat, hairless achene with no pappus.
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| 9. | The inflorescence is a cluster of several pappus on the tip.
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| 10. | The fruits are achenes with whitish hairy appendages ( pappus ).
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