An elusive iris

Still thinking about those roses, but then went off-track and tracked down some iris pr0n. This year I've been seeing these irises all over the place that I never noticed before. They have "banana" colouring, in that they're dark yellow with brown areas, but I haven't been able to find a similar example via the almighty Google. Next time I go for a lunch hour walk, I'll have to choose a route that lets me inspect some a little closer. Working in Wolseley has its benefits. I hope none of the residents mind me oogling their gardens.