I’ve been wondering the same thing for two weeks. There was a pair of these in a bunch of fresh flowers I picked up at the grocery store. They looked to me like cuttings from some sort of ornamental shrub that I had never seen before (or at least never looked at up close). They outlasted the rest of the flowers, so I saved them and added them to the next arrangement. They still look nice today even though they don’t seem to have opened or changed at all.
Where did you get yours?