A google search revealed that Rosebay Willowherb has green pollen. So today I went in search. And it does! I burst open an anther (pictured) and out popped green pollen grains. However I doubt that the bumblebee at Dungeness had collected from Rosebay Willowherb as neither Sally or myself remember seeing any. There was a lot of Greater Willowherb in flower but this does not have green pollen. I checked today. But why should pollen be green? Or is it a case of why not?
Nature is amazing!