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Discovery of male plants of Najas marina L. (Hydrocharitaceae) in Britain

Watsonia 23(2): 331-334

Discovery of male plants of Najas marina L. (Hydrocharitaceae) in Britain

The dioecious, annual macrophyte Najas marina is represented in Great Britain only in the Norfolk Broads. Although it was discovered in 1883 (at Hickling Broad), only female plants had previously been recorded and all seed production was assumed to be apomictic. Following a detailed study of the population biology of this species, the occurrence of male plants at Hickling and Upton Broads in the summer of 1998 is reported. Photographs of the inconspicuous male flowers and pollen are provided.

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Accession: 003408135

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