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ophis: turf-forming rhizomatous sedge
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ophis: tufted stems and creeping rhizomes
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ophis: basal sheaths reddened and bladeless
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ophis: mature spikelets terminal and solitary
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ophis: spikelets with up to about 30 appressed scales
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ophis: achenes teased out of spikelet
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ophis: stigmas usually trifid, expanded at base into persistent tubercles