this paper presents curthis paper presents current knowledge on the floristic composition of the grape-growing fields in the southern Swiss Alps. Data originate from the Swiss national data base of Info Flora, the project BioDiVine and a floristic inventory of the «terroir» vineyards by the Federation of vine growers of Italian Switzerland. A total of 618 species belonging to 322 genera and 90 families were recorded, corresponding to one fifth of the Swiss flora. Vineyards in the Southern Swiss Alps may represent important habitats for species conservation, such as rare ruderal and segetal Calepina irregularis, Gagea villosa, Gladiolus italicus and Misopates orontium, typically in the Sottoceneri area; for species of moist clay soils like Gypsophila muralis and Ranunculus sardous; dry meadows like Aristolochia rotunda (in the Lugano area), Cleistogenes serotina, Filipendula vulgaris, Narcissus x verbanensis and Ophrys sphegodes or siliceous rock or dry stone walls like Asplenium billotii, Asplenium foreziense, Vicia lathyroides, particularly in the Sopraceneri area.