Yep, we are beginning the blackberry flowering too. It should be well going in about another week. The blackberry flow usually begins around June 5 in my locale. That is pretty darn late. But there could be an advantage to a late flowering. The weather will be warmer, less likelihood of rain and the nectar should be flowing harder, my thoughts.
We have three species here too. The small little ones that grow on low, low vines out back. I've never bothered to pick their fruit, but they have been flowering for a good couple of weeks. Setting fruit now, that is weird.
I like both of the other species. The fatter, juicier ones, less seeds, and then the one with the really serrated leaf that comes about 2 weeks later, not as juicy berries, more seeds, but a totally different flavour. Bring on the blackberries and ice cream!!! Beautiful day in this great life. Cindi