Chemical structure of cyperotundic acid from rhizomes of Cyperus rotundus Revision on the Type of Leaf Trace Bundles of Cyperus rotundus L. Effect of Submergence on Physiological Characteristics of Cyperus rotundus in Hydro-fluctuation Belt of Three Gorges Reservoir Area Effect of seed treatment with extract B from Cyperus rotundus Chemical constituents from rhizomes of Cyperus rotundus