Repost, from 2008.
As of 4/16/09, these blooms are out in force. In fact I think I could take an identical picture today, and have seen many such minature rose patches along the highways,
Wild "Arky" Rose.
All pics around April 24, 2008 -Conway AR (c) Kirk Jordan
I suspect there are a number of of rose sub-speciesthat are called wild rose... and this is one of them. The fully opened blooms are just a tad larger than a quarter -- and grow on thorny little brambles that arch, spray, and coil over the ground and small hedges.