Here are links to some pretenders on helpmefind. I am sure this is a native plant or a non native that has become naturalized. I like the advanced search option on hmf.....
Gundheim
http://www.helpmefind.com/rose...
R, laxa, the semi rose
http://www.helpmefind.com/rose...
The found rose has light green to green foilage, not grey green as per above.
Rosa spinosissima var. altaica
http://www.helpmefind.com/rose...
Similar foliage, but the found rose has much smaller flowers
The blackberry rose, R. Rubus
http://www.helpmefind.com/rose...
The best candidate so far, but listed as "not hardy" and "requiring spring freeze protection. This rose is naturalized here, growing in the wild with no care or protection whatsoever.
R. fedtschenkoana
http://www.helpmefind.com/gard...
"The plant suckers WILDLY, helping itself to all the acreage available" - Oh, No Lagerfeld doesn't stand a chance against Olga F.! This one was originally found growing in mountainous regions of Turkey and Russia.
Himalayan Musk Rose, Mrs. Brown's rose, Rosa moschata var. nepalensis Lindl., R. brunonii
http://www.helpmefind.com/rose...
A really nice picture of an archway here
http://www.helpmefind.com/rose...
Experts seem to be debating the hardiness of this one. Some pictures resemble it, but my specimin has smaller flowers - I think there are others as confused as I am.
Muscadelle
http://www.helpmefind.com/rose...
It looks a lot like this Belgian-bred rose. It may be an ancestor, but the lineage wasn't listed on the site.
Dog rose, Briar Rose, Rosa canina L., Rosa sylvestris and others
http://www.helpmefind.com/rose...
Could be a white flowered version. Even the buds are white - no hint of pink at all. The found rose has more blooms per cluster and smaller blooms than most pictures. Like the comments, this one is easily spread by birds.
