The bay of Lövstabukten is located in northern Uppland, E Sweden. Land uplift is c. 6 mm per year and strongly influences the landscape, giving rise to expanding seashores and the gradual transformation of shallow water bodies into lakes. The various habitats that are formed give rise to a diversified flora. The vegetation is also favoured by the calcareous moraine. We describe the plant communities on the shores and on soft bottoms in the bay. Several notable species have been found of which 13 are redlisted. It is notable that all 9 charophytes that have been found in the Bothnian Sea are present in Lövstabukten. We conclude that because of its high natural values, the Lövstabukten area must be protected.