"Fire Anemone
Actinodendron glomeratum
So I do my usual thing of petting my anemone, and out of my surprise this fire anemone upon touch it sting a bit like the carpet anemone (S.haddoni), so I was thinking it's nothing too bad. This thing is very evil thou, it leaves traces of its tenacles sticking to your skin, and the really painful and scary part actualy comes in 3-5 seconds after I touch the anemone's tenacles. OH MY GOSH, it stings like I am literally burnt by a lighter, and not just a quick burn but burning under a light for 3-5 seconds. The pain was ultra intense and I had to find water to immediately wash it for a long time to get rid of the immediate pain. After that, it is still painful to even move my fingers, the part that was burn had a bit of red & swelling. It is almost 7 hours since and I can still feel the pain, it's almost like you were burnt by a fire.
Just a warning to anybody who likes to pet their anemones In the past, I have touched and get stung by various BTA , sebae, LTA , carpet etc..etc.., nothing is as crazy as this, the worst was more like a little sunburn that is gone after a day or two. I guess the name fire anemone really mean something."
http://archive.reefcentral.com/forums/showthread.php?t=1268045