and another picture.

Reminds me of Lacy Snowflake, but mine is a bit more "lacy" looking at the edges of the falls.

Here's a "lacier" picture of it.. but I don't think of it as really frilly...

I read all the descriptions and think Lacy Snowflake is a good fit.. Thank-you ngraham!

I agree with Lacy Snowflake.

Yes, that looks just like my Lacy Snowflake

I meant to add, it is tall, mid to midlate blooming & a large flower. I wish one could get more description on size of iris blooms. Iris can look very similar from photos, you can't tell size though.

Yes, it's tall, mid-late... I'd been calling it Dorothy's big white all these years after the friend who gave it to me.
You can get an idea of how large it is next to I. pallida ' Varieg.' in this lousy picture. I'd say it's certainly one among my tallest iris...

What a beautiful flower ... I would continue to call it " Dorothy's big white " after your friend that gave it to you :)

Wow, what a beautiful garden. Those irises are perfect in that spot!