The picture looks like 'sopra il vulcano'
Nameless in my garden?

Looks very similar, although I'm not sure about the underside of the falls, which in my pic are the same colour as the standards. From your photo, yours look darker, but it might just be the lighting. Could you have a look, or do you have a photo showing the underside of the falls?

I only have this photo,and is it a general iris.

Not sure what 'general iris' means?

Frequent

Sorry for my bad englisch

Perhaps if you wait until the next time it blooms and have a look at the underside of the falls?