Hi, the May 2009 picture by Cass caught my attention. It shows some buds whose petals are somehow leaking sideway out of the sepals.
Last spring I was investigating a rose previously found in the edge of an abandonned orchard, blooming from Spring to november. Its buds very recurrently showed the same habit, both on original plant and cutting. Whether looking at pictures or at other shrubs in my garden, I only found this habit on damask roses, some gallicas, the 'bourbon' Rouge Marbrée, and Belle De Baltimore, which is said to be a Gallica hybrid.
I didn't find the time to pursue my researches, but the 1846, and also 1848 references about damask perpetual Belle De Trianon and Vibert's work from it had me wonder if some of the old noisette-looking found roses could belong to another class... I am joining some pictures of the rose I found.