Close up of the flowers of BH3.
Skipped getting pictures of BH2 because it's the most boring of the four. Here's BH4 which has the distinction of being an extremely pale pink.
All four of these hybrids have reduced fertility. In the few hips that remain, they will typically only have 1-4 seeds. But at least they aren't completely sterile. I really should try putting more pollen on them rather than just letting them open-pollinate. Then maybe I'd get a few more seeds, and the offspring would have a better chance at