A perennial herb with a short rhizome and reddish roots, stem usually slender, 10-40(-100) cm long. Leaves 2-5 mm wide, flat, smooth or scaberulous at the top. Inflorescence compound or decompound, involucral bracts 2-3, up to 10(-15) cm long, primary rays up to 20, up to 15(-20) cm long, spikelets digitately arranged, 10-30(-40)-flowered; stamens 1-3, stigmas 3. Fruit trigonous, broadly obovoid, whitish, later yellowish.
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