Al Schneider's Rocky Mountains Plant Descriptions

Russian-olive
Elaeagnus angustifolia
Oleaster family (Elaeagnaceae)

The Russian Olive was intentionally introduced from southern Europe as an ornamental shade tree and a source of cover and food for wildlife and it was also widely distributed across the West as a windbreak in the 1930s. It commonly invades riparian and wetland areas and replaces native vegetation. Its intentional planting is no longer encouraged. All federal and many local land agencies have mounted massive, costly efforts to eradicate this tree. "Elaeo" is Greek for "olive" and "agnos" for "chaste." "Angustifolia" is Latin for "narrow leaved." Linnaeus described this plant from Eurasia in his 1753 "Species Plantarum."


©2004 Al Schneider

Description

Medium-sized tree, to 40' tall, and several feet thick, non-native, grows rapidly with a distinct silver and green foliage. Leaves are , narrow, 2-4" long, covered with starburst hairs and , more abundant on underside. Young shoots silvery gray turning woody with furrowed, somewhat shredding bark in age. Trunk and branches often armed with 1-2" woody . Flowers are intensely fragrant, silvery, with yellow , somewhat hairy with starburst hairs; forming a 4- trumpet. shaped like small olives, silvery when they first appear, turning brown at maturity, enveloped in a fleshy covering, hence -like.

Field Marks

Tree with silvery foliage, , yellow 4- trumpet flowers, olive-like .

© Al Schneider

scale -- A very small leaf around a dormant bud. Also other things that might remind one of fish scales on the surface of ferns, stems and the like.

lobe -- Being divided by clefts.

lobe -- A rounded parts of a leaf (or other organ).

thorn -- a sharp, still point, usually a modified stem, that cannot be detached without tearing the subtending tissue. A spine.

achene -- a type of simple dry fruit produced by many species of flowering plants. For example, a rose hip holds a few achenes.

calyx -- the sepals of a flower, typically forming a whorl that encloses the petals and forms a protective layer around a flower in bud.

fruit -- any seed-bearing structure in flowering plants. It is formed from the ovary after flowering.

drupe -- A fruit in which an outer fleshy part surrounds a hardened shell containing a seed. A peach is a drupe. A raspberry is composed of drupelets.

alternate -- leaves alternate along the main stem and are attached singly.

indehiscent -- a fruit not opening at maturity.