Empetrum nigrum,
crowberry,
black crowberry, or, in western Alaska,
blackberry, is a flowering plant species in the heather family Ericaceae with a near circumboreal distribution in the northern hemisphere. It is also native in the Falkland Islands. It is usually dioecious, but there is a bisexual tetraploid subspecies,
Empetrum nigrum ssp. hermaphroditum, that occurs in more northerly locations and at higher altitude.
(Wikipedia)