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ophis: detached perigynia and scales
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ophis: perigynia veinless with spongy-thickened bases
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ophis: perigynia and achenes
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ophis: fertile stems with most perigynia fallen
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ophis: spikes with threadlike bracts
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ophis: fertile stems numerous, longer than leaves
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ophis: densely tufted
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ophis: stems brown and fibrillose at base