Here's my pleasant surprise for Spring 2010. Rosa palustris did accept pollen from 'Home Run' (seedlings on left). They are definitely more pigmented and the foliage shape is closer to a "modern" type than the selfed palustris seedlings (on the right for comparison).
Here's an end of summer shot, right before they were planted in the ground. Turns out there were ten of them. I'll bet they'll be much happier in the ground, considering how undernourished they were and also suffering from irregular watering.