THE SPECIES OF FRAGARIA, THEIR TAXONOMY AND GEOGRAPHICAL DISTRIBUTION
Twenty species of strawberry can be recognized on the basis of investigations of over 500 accessions of wild growing samples collected from all over the world and of specimens from the main relevant herbaria. These species are distributed throughout the holarctic zone with a few endemic spreadings into the tropics. Only one species, the diploid Fragaria vesca, 2n = 14, differentiated into four regional subspecies, is found in both Eurasia and America. All other species are restricted to single continents or specific areas within them. The diploid species have two centers of diversity namely Central Asia and the Far East. Tetraploid species are confined to East and South East Asia and the only hexaploid one to Europe. The octoploid species have their main distribution in North and South America but one species is endemic in the Far East (southern Kuriles).
Stauct, G. (1989). THE SPECIES OF FRAGARIA, THEIR TAXONOMY AND GEOGRAPHICAL DISTRIBUTION. Acta Hortic. 265, 23-34