Iris ensata 'Moonlight Waves'
3rd June 2009
I don't think this is the real thing, it seems to be a form of Iris sibirica.
22nd July 2015
This one might be. It should be a pure white, ruffled flower with yellow flashes at the base of the petals and this seems to fit.
Introduced to the trade in 1910 by Robert Wallace or Robert W Wallace & co, of Tunbridge Wells. It has been suggested that it was bred by Arthur J. Bliss because most of the Bliss cultivars were introduced by Wallace. (Ballyrobert Gardens)
21st June 2017
20th June 2020
The American Iris Society Encyclopedia, https://wiki.irises.org