Rosa multiflora

I've been shearing it from our local park, of which there is the following Wikipedia entry: "This plant is readily distinguished from native roses in the U.S. by its flower or seed heads, which bear multiple flowers and hips, often more than a dozen, while the native species bear only one or a few on a branch".

Rather I have been thinking about how to distinguish it from native greenbriar, which grows alongside it, before the leaves fall. I think the rose has more of a caning habit than the greenbriar, which seems to grow more loosely.