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In this paper, a new subspecies of Cyperus sanguinolentus Vahl is described. Changes in the nomenclature of five species of Cyperus are gien. One new plant record for India, five or eastern India and two for W. Bengal are presented. Critical notes on Cyperus alopecuroides Rottb. and on C. corymbosus Rottb. complex are also included.
B. C. Korlahalli (Mon,) studied this question.