Clownfishes and Sea anemones
I only found this two references, but these are only secondary sources at the moment.
Look here "Clown Fish Anemone" and here "Choosing Clownfish and Anemones for Your Aquarium". It seems that there are only around two handful of anemones capable of supporting clownfish. 
Here are some primary sources which confirm the 10 anemone species: "The anemonefish symbiosis: What is known and what is not." and "Field guide to anemonefishes and their host sea anemones". The last two links point to PDFs which contain a lot more references.