It's not an anemone. it is a Coralimorph. More closely related to Ricordea than anemones.
They have been lableded as anemones by pretty much every vendor that has sold them but they are being misidentified.
I had one that looked exactly like that. Be careful with these guys if you get one. They have a pretty potent sting and can easily catch large fish if they wander to close. My clowns wouldn't host in them due to the potency of the stinging cells in the bulbs.
They are non-photosynthetic and really open up at night. I fed mine silversides and krill and they seem to be very hardy.