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

, : Discovery of male plants of Najas marina L. (Hydrocharitaceae) in Britain. Watsonia 23(2): 331-334

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.

Accession: 003408135

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Related references

Stuckey R.L., 1984: Distributional history of najas flexilis najas gracillima and najas marina najadaceae in eastern north america. Ohio Journal of Science 84(2): 4-5

Nelson, E.; Couch, R., 1981: Occurrence of Najas minor and Najas marina (Najadaceae) in Oklahoma Vascular aquatic flora. Proceedings of the Oklahoma Academy of Science1(61): 78

Triest, L., 1989: Electrophoretic divergence between najas marina l. and najas horrida magn. from northeast natal south africa. The division of the genus Najas L. into two subgenera, Najas and Caulinia (Wild.) Rendle, according to their morphology, might be supported by the study of their isozymes. The two most resembling species of each subgenus, N. marina L. and N. horri...

Winge, O., 1927: Chromosome behaviour in male and female individuals of Vallisneria spiralis and Najas marina. The same chromosome equipment (20 chromosomes) is found in somatic divisions of both [male] and [female] plants, disproving the former view in regard to a definite sex chromosome. Study of the reduction division in pollen mother cells shows that t...

Casper, Sj, 1979: Contributions to the taxonomy and chorology of European water and swamp plants. 2. What is Najas marina L.?. Feddes Repertorium0(4): 217-238

Lojtnant, B.; Worsoe, E., 1977: Threatened and vulnerable danish vascular plants 5 najas marina and 6 herminium monorchis. At least 30 native Danish vascular plants became extinct in the last 150 yr. Just as many more species are now threatened with extinction. The status of the individual vulnerable species in Denmark and ways to protect these species are discussed....

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Nelson E.N.; Couch R.W., 1981: Occurrence of najas minor new record and najas marina new record najadaceae in oklahoma usa. Proceedings of the Oklahoma Academy of Science 61: 78

Les, D.H.; Peredo, E.L.; Benoit, L.K.; Tippery, N.P.; King, U.M.; Sheldon, S.P., 2014: Phytogeography of Najas gracillima (Hydrocharitaceae) in North America and its cryptic introduction to California. The discontinuous North American distribution of Najas gracillima has not been explained satisfactorily. Influences of extirpation, nonindigenous introduction, and postglacial migration on its distribution were evaluated using field, fossil, morph...

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