Ecology and phytosociology of endangered psammophytic species of the Omphalodes genus in western Europe

摘要: AbstractOmphalodes kuzinskyanae Willk. is an endangered annual plant of the family Boraginaceae, endemic to a narrow coastal area in Lisbon region (Portugal). Omphalodes littoralis Lehm. occurs northwest Spain (subsp. gallaecica) and France littoralis). Three approaches were used assess ecological requirements O. kuzinskyanae: (1) physical chemical characterization their habitat soil; (2) phytosociological analysis; (3) comparison several life history parameters under different light conditions. Germination experiments conducted evaluate seed dormancy. The results show that thin sandy soil with substantial amount organic matter clay, mostly over limestone pavements. Phytosociological analysis shows both sciophytic heliophytic communities. Life comparisons demonstrated this has strong preference for conditions: shade, plants have higher su...