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ophis: ragweed in bloom
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ophis: short-peduncled male flower heads, ragweed
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ophis: raceme with male and female flower heads, ragweed
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ophis: one-flowered female flower heads, ragweed
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ophis: clustered one-flowered female heads, ragweed
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ophis: detached clusters of female flower heads, ragweed
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ophis: maturing female flower head with involucre removed