Minuartia biflora; The Northern Sandwort is a small plant growing on higher altitudes. It can easily be confused with other white-flowering members of the Pink family (other Minuartis's , Sagina's, etc.). The easiest way to recognize this species is by looking at at the stem from above the highest leaf-pair. This part of the stem is relativily short and short-haired. The calyx leaves are relativily long; the petals spread horizontally just above the sepals.
It is a member of the Pink family (Caryophyllaceae). The Icelandic name of this species is Fjallanóra.