Whoa. Why don't I ever get mystery gifts like that???? It sure is RED!!!!! Is it a tall one Bonnie?
I did come across several very small Iris rhizomes sitting on my deck a couple years ago. Someone had dropped them off. I planted them and two years later they bloomed and were my Blue Reflection. That Iris was among the Irises that comprised a box full that I had given my neighbor across the street -- a year earlier. Apparently, they were never planted, and those little rhizomes of Blue Reflection survived sitting in a box (outdoors) for a year. She must have felt guilty for not planting them, and returned them.
People mystify me -- they ask for rhizomes -- and then never plant them.