Presenting information on the biodiversity support that plants provide is very difficult. It will be very different from one place to another. There is also a shortage of hard evidence. My approach here will be more along the lines of providing links to reliable sources for particular regions, or where I have been able to cull material from multiple sources.

At the moment there is just the one entry, for central European pollinators, but which should also be a pretty good indication for the rest of Europe