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ophis: mature 1.6 mm achenes, tansy
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ophis: phyllaries, achenes, and wilted flowers, tansy
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ophis: head in fruit, tansy
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ophis: flower head with persistent unexpanded achenes, tansy
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ophis: dry flower heads, tansy
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ophis: dry flower heads, tansy
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ophis: persistent phyllaries in 3-4 series, tansy
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ophis: heads in fruit, tansy
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ophis: dried flat-topped inflorescences, tansy