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ophis: 6 mm tuber jacketed in dark-veined membrane and with basal rhizome already withered and broken
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ophis: tuber filled with starchy white flesh
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ophis: trigonous stem filled with fibrous white pith
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ophis: mature inflorescence, yellow nutsedge
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ophis: elongate outer rays of terminal umbel subtended by leaflike bracts and with sleeve-like basal prophylls with obliquely truncate summits
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ophis: bottle-brush spikes terminating rays of umbel in groups of 1-4
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ophis: narrow spikelets to 1.5 cm with up to sixteen distichous scales
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ophis: tiny beige obovate 1 mm achenes fall from rachis with subtending ovate scales
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ophis: base of plant with tuber found among roots and rhizomes