INTRASPECIFIC BIODIVERSITY IN MEADOWS .3. CHOROLOGICAL AND ECOLOGICALVICARIOUS SPECIES FROM THE EAST OF FRANCE AND GENERAL CONCLUSIONS

In this study, two vicarious groups from the North East of France are analysed. In the Lathyrus pratensis group, the oriental diploid cytoty pe is replaced along the valleys of the Moselle and Meuse by the tetra ploid one which is a South Western plant. In the Southern part of this territory, in the Jura, the two cytotypes are sympatric and their dis tribution is then ecological, the tetraploids being in the hydrophytic part of the territory. In the Dactylis glomerata group, two taxas, on e diploid (D. g. ssp. lobata) and one retraploid (D. g. ssp. glomerata ) are sympatric in the North Eastern region where they are growing in different habitats, but they are able to hybridize, as morphological a nd biochemical proofs show.