This is Iris domestica, often called blackberry lily or leopard lily and formerly known as Belamcanda chinensis. It’s a perennial plant that we have in various places in our garden. We gather the seeds most years and spread them in areas we would like it to grow, although I don’t know if we’re doing as well as the birds when it comes to actually spreading it. As you can see, it has vaguely lily-like flowers and they are quite lovely. They each last a day but they are born in clusters, blooming one after the next for quite a while. In case you were wondering, the genus name Iris comes from the Greek goddess of the rainbow.