Compare head and cyathium inflorescences.
Head
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Cyathium
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1. It is racemose inflorescence that looks like a single flower
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It is special inflorescence that looks like single flower
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2. Bracts of involucre are free or fused
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Fused to form cup like structure
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3. Flowers are sessile
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Pedicellate
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4. Flowers are arranged in centripetal manner
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Centrifugal manner
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5. Chlamydeous unisexual or both unisexual and bisexual flowers
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Unisexual flowers are achlamydeous.
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6. Nectaries are not present on the involucre
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Present on the involucre
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