Wow, it's GORGEOUS! Looks like it has some great big flowers. Does it have purple based foliage? That can be a clue. There is a list of known "PBF" irises online but because I'm still too new here, I am not allowed to post the link. 😞😞 If you aren't familiar with what I mean, some iris cultivars have a tinge of reddish-purple coloring at the bases of the leaves and/or stalk. Some types have just a little, and others have a very pronounced purple/reddish shading. This is a genetic characteristic and for many cultivars, it's a "breed standard". One well known white TB with PBF is 'Snow Goddess', which I have in my garden. There are others. This can help narrow down the field, but there are still quite a few with this trait. You can use the PBF along with other traits such as beard color, bloom time, reblooming traits (more than one bloom period-- 'Immortality' is an example of a white TB iris that is known to rebloom); veining color, etc. to further help you out.
Or, you can simply love your beautiful angelic iris for all of its magnificent glory and call it whatever you want as long as it is in your garden and don't tell anyone that the name you call it is a real cultivar name! 😍😍
