Oleaster, Russian Olive (Elaeagnus)
This genus of small, bushy trees (commonly planted in rural districts of eastern Oregon) is not native to Oregon and is currently not fully described on this website.
(click on each photo to enlarge image)
For more information on this tree, check here:
trees by common name trees by scientific name dichotomous key mystery tree
website authors order a book "Trees to Know" more informational sites