Erigeron uniflorus; The oneflower fleabane aka dwarf fleabane, is a smaller fleabane compared to the more common Alpine Fleabane (E. borealis). The best way to distinguish it is by the larger flowerheads and rounded base of the flowerheads compared to a more tapered base of alpine fleabane flower heads. It grows in mountain slopes. A third species is the Arctic Alpine Fleabane (E. humilis). This species grows in the high mountains. It can be distinguished by the purple hairs on the flower heads (E. borealis and E. uniflorus have white hairs on the flowerheads).
It is a member of the Asteraceae family (= Compositae ), the daisy family. The Icelandic name of this species is Fjallakobbi.