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of distribution, population estimates and threat assessments. We conclude that about 93% of the total population is located in NW Spain (23 confirmed sites, mostly in Galicia), with a highly fragmented distribution; about 57% of the Spanish population can be considered threatened and about 2% severely threatened (i.e. immediate risk of extinction). It is thus classifiable as Endangered in Spain, Critically Endangered in France (where it has only a single population) and Endangered worldwide.Key words : aquatic plant -habitats Directive -atlantic endemic species -area of distribution -habitat fragmentation -small population.Resume.-Eryngium viviparum Gay est une espece menacee, ainsi consideree dans plusieurs catalogues europeens comme Ia Convention de Berne de 1979 (Annex 1), les listes successives de I' UICN (1983UICN ( , 1992UICN ( , 1997

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