I believe this is Canadian Buffaloberry ~ Shepherdia canadensis

" Plains tribes believed that when the berries were ripe,

the buffalo were fat enough to hunt "

Plants of Alberta

Royer/Dickinson

" Our berries picked,

the mushrooms gathered,

each of us hides

in his heart a small piece

of this summer,

as mice store their roots

in a place

known only to them. "

                    Poem

                   John Haines